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Warning lights and driver messages
Warning lights and driver messages
Vehicle warning lights
Engine, lubrication and cooling
Emissions system – MIL steadily lit · multiple meanings of the same symbol
Emissions system – MIL steadily lit
Yellow / amber · Warning · Steady
Meaning
An emissions system fault has been detected. The symbol alone does not identify a failed component.
Recommended action
Reduce load and arrange inspection as directed by the manual and message. If running is abnormal, other warnings appear or STOP is displayed, stop safely and seek assistance.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Audi emissions system – indicator lit or flashing
Yellow / amber · Warning · Steady / flashing
Meaning
Steady or flashing illumination indicates an emissions-related fault that can worsen exhaust quality and damage the catalytic converter. Depending on engine and country, the indicator can also illuminate if the fuel cap is not properly closed. The symbol alone does not identify a failed component.
Recommended action
Check that the fuel cap is properly closed. If the indicator flashes or remains illuminated, drive immediately at reduced speed to a qualified workshop and have the fault corrected. Follow every accompanying message.
Key indication
Illumination during the ignition check does not by itself establish a fault. Whether the indicator goes out after the check, its subsequent behaviour and the accompanying message are decisive. The A8 manual gives one instruction for steady and flashing states, so they are not artificially split here.
Low engine oil pressure
Red · Warning · Steady / flashing
Meaning
Lubrication pressure is too low. A correct oil level does not confirm sufficient pressure.
Recommended action
Stop safely and switch off the engine. If the warning persists, even with the correct level, do not leave it idling; obtain professional assistance. Follow the manual for further steps.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Diesel particulate filter – DPF · multiple meanings of the same symbol
Diesel particulate filter – DPF
Yellow / amber · Warning
Meaning
On relevant diesel versions it indicates accumulated soot and a need for filter regeneration.
Recommended action
Check regeneration driving conditions in your specific manual. If other warnings appear or engine operation is abnormal, do not follow a universal internet regeneration procedure.
Key indication
No single speed, duration or engine speed applies to all engines. Petrol GPF/OPF requires separate verification.
Petrol particulate filter – regeneration required
Yellow / amber · Warning · Symbol with message
Meaning
On the documented petrol implementation, the filter requires regeneration. The symbol alone does not identify a damaged filter.
Recommended action
First identify the exact engine and the manual procedure. Do not attempt a generic regeneration drive with other warnings or abnormal operation; arrange a professional check if the message persists.
Key indication
Q3 11/2024 specifies different procedures for different petrol engines. This is not a universal GPF/OPF procedure or a diesel DPF procedure.
Brakes and stability systems
Brake system fault · multiple meanings of the same symbol
Brake system fault
Red · Warning · Steady
Meaning
The red warning indicates a brake system fault. Read the accompanying message; this is not the normal parking brake confirmation.
Recommended action
Stop safely. Do not continue driving and obtain professional assistance. Topping up fluid does not repair the cause of fluid loss.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Low brake fluid level
Red · Warning · Steady
Meaning
A message with the red brake symbol indicates that the brake fluid level is too low.
Recommended action
Do not continue driving. Stop safely and obtain professional assistance; low fluid can lead to brake failure.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Brake pad wear
Yellow / amber · Warning · Steady
Meaning
The system indicates that the brake pads require inspection.
Recommended action
Arrange prompt professional brake inspection and pad replacement as required. The lamp does not indicate how many kilometres remain before replacement.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
ABS fault
Yellow / amber · Warning · Steady
Meaning
The anti-lock braking system is not working correctly or is unavailable. Normal braking may remain available without ABS protection.
Recommended action
Arrange professional inspection promptly. If a red brake warning or STOP instruction also appears, stop safely and follow the exact message.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
ESC / TCS intervention · multiple meanings of the same symbol
ESC / TCS intervention
Yellow / amber · Operating information · Flashing
Meaning
Flashing indicates that stability or traction control is intervening. It does not by itself indicate a fault.
Recommended action
Adapt speed and driving style to available grip and traffic conditions. The system cannot overcome physical limits.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
ESC fault or system-induced deactivation
Yellow / amber · Warning · Steady
Meaning
A lamp that stays on after the initial check may indicate a fault or system-induced deactivation. This differs from flashing during intervention.
Recommended action
Read the message and follow the cited manual. If the lamp remains on, arrange professional inspection; do not rely on stability control being available.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Parking brake applied
Red · Operating information · Steady
Meaning
A red P in a circle confirms that the parking brake is applied. It is an operating status, not automatically a fault.
Recommended action
Release the parking brake as instructed before driving away. When parking, check that the vehicle is secured safely.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Hold assist – vehicle held (green P)
Green · Operating information · Steady
Meaning
The hold assistant is holding the stationary vehicle. This green P is distinct from the red parking-brake confirmation.
Recommended action
Remain ready to brake. The system cannot hold the vehicle under all conditions; secure it properly before leaving.
Key indication
Only the specified versions with a hold assistant. Not red parking-brake confirmation, white assistant deactivation or the separate transmission-position P.
HOLD – vehicle being held
Green · Operating information · Steady
Meaning
The green inscription confirms that the hold assistant is holding the stationary vehicle with its operating conditions met.
Recommended action
Remain ready to brake and check that the vehicle is safely stationary. Follow the manual when moving off. Secure the vehicle before leaving; HOLD is not a universal substitute for the parking brake.
Key indication
Only the cited Q4 e-tron equipment and manual edition are covered. A different message requires its own interpretation.
ESC OFF – stability control switched off
Yellow / amber · Operating information · Steady
Meaning
The separate amber ESC OFF inscription indicates deactivated stability functions according to the specified manual. Not automatically a fault and not the plain skidding symbol.
Recommended action
Allow for the reduced safety margin. Use the mode only when required by conditions and allowed by the manual; restore stability control as soon as possible.
Key indication
Distinguish Sport mode, TCS deactivation and full ESC deactivation by message and exact symbol. An ignition function-check phase may occur.
Steering, chassis and tyres
Low tyre pressure or tyre damage · multiple meanings of the same symbol
Low tyre pressure or tyre damage
Yellow / amber · Warning · Steady
Meaning
The system detected a significant change from stored values. The listed versions use indirect monitoring based on ABS data.
Recommended action
Stop safely and check all tyres and pressures. Store reference values only after proper inspection and correction; resetting does not repair a puncture.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Direct tyre-pressure monitoring – low pressure
Yellow / amber · Warning · Symbol with message
Meaning
In the specified direct system, a steady amber tyre with exclamation mark can indicate pressure below the stored reference. The accompanying message determines the exact meaning.
Recommended action
Check all tyres and correct pressure to the specified values at the next safe opportunity. Store correct reference values only after checking; stored values do not themselves prove compliance with the manufacturer’s specification.
Key indication
Only equipment with direct wheel pressure/temperature sensors. The same symbol with “Reifenpanne!” or “Radwechsel erkannt” has a different meaning. Do not transfer the procedure to indirect monitoring. In the direct system’s numerical display, green means approximately matching the stored reference, amber low pressure and red substantially low pressure. Dashes while stationary or learning are not measured pressure. Check tyre pressure at the appropriate temperature according to the manual; releasing air from hot tyres is not a general procedure.
Direct tyre-pressure monitoring – “Reifenpanne!” warning
Yellow / amber · Warning · Symbol with message
Meaning
The symbol together with the explicit puncture message indicates critically low pressure relative to the stored reference. Amber alone is not permission to continue.
Recommended action
Avoid unnecessary abrupt steering and braking. Stop safely at the next opportunity and inspect the tyres. Actual condition and the manual determine whether further travel is possible; do not merely reset the warning.
Key indication
Applies to the exact “Reifenpanne! Fahrzeug sicher abstellen. Bitte alle Reifen prüfen und im MMI speichern” message with the specified direct system. The symbol alone establishes neither damage extent nor a safe remaining range. In the direct system’s numerical display, green means approximately matching the stored reference, amber low pressure and red substantially low pressure. Dashes while stationary or learning are not measured pressure. Check tyre pressure at the appropriate temperature according to the manual; releasing air from hot tyres is not a general procedure.
Direct tyre-pressure monitoring – wheel change detected
Yellow / amber · Operating information · Symbol with message
Meaning
With the “Radwechsel erkannt” message, the same amber symbol can report changed sensor positions after a wheel swap or newly fitted sensors. Not automatically the same as critically low pressure.
Recommended action
First check all tyres and their specified pressures, then store correct reference values using the actual MMI procedure. The driver remains responsible for correct pressure; confirmation does not repair a tyre.
Key indication
Meaning is documented only with the exact message and direct sensors. The icon alone does not distinguish low pressure, critical loss and a wheel change. In the direct system’s numerical display, green means approximately matching the stored reference, amber low pressure and red substantially low pressure. Dashes while stationary or learning are not measured pressure. Check tyre pressure at the appropriate temperature according to the manual; releasing air from hot tyres is not a general procedure.
Steering – red warning
Red · Warning · Steady
Meaning
Steering fault; power assistance may be unavailable.
Recommended action
Stop safely and do not continue driving. Obtain professional assistance.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Steering – restricted operation
Yellow / amber · Warning · Steady
Meaning
Steering assistance or response may differ from normal.
Recommended action
Follow the message and manual procedure. If the lamp remains on after that procedure, have the steering checked by a specialist workshop.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
TPMS – tyre-pressure monitoring fault
Yellow / amber · Function restricted · Symbol with message
Meaning
Tyre-pressure monitoring is unavailable or restricted. This is the TPMS inscription, distinct from the low-pressure warning.
Recommended action
Check tyres and pressures and follow the vehicle message. Have the system professionally checked; resetting does not repair a leak or a fault.
Key indication
Only the versions listed with each source are covered; calibration follows the actual equipment.
Airbags and safety systems
Seat belt not fastened
Red · Warning · Steady / flashing
Meaning
The warning indicates an unfastened driver’s or passenger’s seat belt. It may flash and sound while driving.
Recommended action
Before driving, ensure all occupants fasten their belts correctly and children use an appropriate restraint.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Airbag and belt tensioner fault
Yellow / amber · Warning · Steady / flashing
Meaning
The lamp stays on after the initial check or flashes. Airbags and belt tensioners may not work correctly.
Recommended action
Have the system checked immediately. Do not confuse it with the separate passenger airbag OFF indication.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Lighting and visibility
Main beam headlights
Blue · Operating information · Steady
Meaning
Main beam or the headlight flasher is on.
Recommended action
Use them considerately and dip in good time to avoid dazzling others.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Rear fog light
Yellow / amber · Operating information · Steady
Meaning
The rear fog light is on. This is an operating indication, not an engine fault.
Recommended action
Use it according to visibility and applicable rules. Switch it off when visibility improves.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Exterior lighting fault
Yellow / amber · Warning · Steady
Meaning
The vehicle has detected a lighting fault. Identify the affected light from the message and inspection.
Recommended action
Check the lights and arrange repair. Follow the manual; some light sources are not user-replaceable.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Turn signals or hazard warning lights
Green · Operating information · Flashing
Meaning
Flashing indicates turn signals or hazard warning lights in operation. A faster rate may indicate a failed turn signal on the listed versions.
Recommended action
Check that the lights work correctly. Use hazard lights as appropriate when securing the vehicle.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Headlight range control – fault
Yellow / amber · Warning · Symbol with message
Meaning
Headlight range control has a fault; incorrectly aimed headlights may dazzle other road users.
Recommended action
Arrange an immediate professional check and adapt driving to lighting conditions and the vehicle message.
Key indication
This is not a main-beam-on indicator or a general explanation for every lighting symbol.
High-beam assist – main beam on (AUTO)
Blue · Operating information · Steady
Meaning
The assistant has switched on main beam automatically. The blue AUTO symbol differs from the white enabled-assistant indication.
Recommended action
Monitor traffic and lighting. If the automatic system does not respond correctly, control the lights manually to avoid dazzling others.
Key indication
This meaning is documented for the cited versions with this assistant and the AUTO inscription. Do not confuse it with the A-inside-the-symbol variant used on another brand.
High-beam assist – enabled (AUTO) · multiple meanings of the same symbol
High-beam assist – enabled (AUTO)
White · Operating information · Steady
Meaning
The white operating indication without a fault message shows that the assistant is enabled. It does not mean that main beam is currently on.
Recommended action
Check current lighting and traffic and switch the lights manually when needed.
Key indication
A fault or restricted-camera-view message requires the separate unavailable-state explanation.
High-beam assist – fault or unavailable
White · Function restricted · Symbol with message
Meaning
With the corresponding message, automatic switching may not work. Restricted camera visibility or a fault may be involved; the symbol alone identifies no defective part.
Recommended action
Control main beam manually according to traffic. Follow the manual for temporarily restricted visibility; have a persistent fault professionally rectified.
Key indication
A white AUTO symbol without a fault message may simply indicate an enabled function. The full message determines the meaning.
Left direction indicator
Green · Operating information · Flashing
Meaning
Flashing indicates turn signals or hazard warning lights in operation. A faster rate may indicate a failed turn signal on the listed versions.
Recommended action
Check that the lights work correctly. Use hazard lights as appropriate when securing the vehicle.
Key indication
The individual arrow shows the relevant direction. Both arrows flashing together during hazard operation are a different state not depicted by this image.
Right direction indicator
Green · Operating information · Flashing
Meaning
Flashing indicates turn signals or hazard warning lights in operation. A faster rate may indicate a failed turn signal on the listed versions.
Recommended action
Check that the lights work correctly. Use hazard lights as appropriate when securing the vehicle.
Key indication
The individual arrow shows the relevant direction. Both arrows flashing together during hazard operation are a different state not depicted by this image.
Driver assistance systems
Driver alert – break recommendation
White · Warning · Symbol with message
Meaning
The system recommends a break based on driving behaviour. It does not measure health or guarantee detection of every case of fatigue.
Recommended action
If tired, stop safely and rest. Do not wait for a system warning; the driver remains responsible for being fit to drive.
Key indication
White information version of the cup; display background and accompanying message vary by version.
Cruise control actively regulating
Green · Operating information · Steady
Meaning
Cruise control is switched on and maintaining the selected speed. This does not confirm distance regulation.
Recommended action
Always adapt speed and safe distance to the situation yourself. Watch traffic, be ready to take control and do not use cruise control in unsuitable conditions.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Take over steering immediately
Red · Warning · Steady
Meaning
The vehicle requests immediate driver steering control.
Recommended action
Safely take over steering immediately, monitor traffic and follow the exact vehicle message. Be ready to brake.
Key indication
The indicator illuminates red with an accompanying message; depending on the situation, a sound or steering-wheel vibration follows. The reviewed chapters do not state flashing. Association with Travel Assist, Emergency Assist or Lane Assist depends on equipment and the cited manual.
Take over steering – yellow Audi request
Yellow / amber · Warning · Symbol with message
Meaning
Insufficient driver steering activity was detected or a system limit was reached.
Recommended action
Immediately take active, safe control of steering. Keep your hands on the wheel and be ready to brake; do not rely on the assistant to handle the situation independently.
Key indication
Distinguish yellow and red requests using the message. On this implementation, even the yellow request requires immediate action.
Side assist – restricted or unavailable
Yellow / amber · Function restricted · Symbol with message
Meaning
With a fault message, blind-spot monitoring is unavailable or restricted. The symbol alone does not identify a defective sensor.
Recommended action
Monitor surrounding traffic directly. Follow the manual to check the rear sensor areas for contamination and observe weather-related limitations. Have a persistent message professionally checked.
Key indication
This is an instrument-cluster status message, distinct from a normal exterior-mirror warning when a vehicle is detected.
Side assist – restricted or unavailable
White · Function restricted · Symbol with message
Meaning
With a fault message, blind-spot monitoring is unavailable or restricted. The symbol alone does not identify a defective sensor.
Recommended action
Monitor surrounding traffic directly. Follow the manual to check the rear sensor areas for contamination and observe weather-related limitations. Have a persistent message professionally checked.
Key indication
This is an instrument-cluster status message, distinct from a normal exterior-mirror warning when a vehicle is detected.
Lane departure warning – restricted or unavailable
Yellow / amber · Function restricted · Symbol with message
Meaning
With the corresponding message, lane departure warning and any lane guidance are unavailable or restricted.
Recommended action
Steer independently and watch the road markings. Check the message and camera visibility as instructed; obtain a professional check if the issue persists.
Key indication
This meaning is documented for the explicitly cited Q3 and Q4 e-tron editions. A similar yellow symbol on another brand may indicate a corrective intervention; the meaning is not automatically transferred.
Lane departure warning – restricted or unavailable
White · Function restricted · Symbol with message
Meaning
With the corresponding message, lane departure warning and any lane guidance are unavailable or restricted.
Recommended action
Steer independently and watch the road markings. Check the message and camera visibility as instructed; obtain a professional check if the issue persists.
Key indication
This meaning is documented for the explicitly cited Q3 and Q4 e-tron editions. A similar yellow symbol on another brand may indicate a corrective intervention; the meaning is not automatically transferred.
Adaptive cruise assist – restricted or unavailable
Yellow / amber · Function restricted · Symbol with message
Meaning
With a fault message, some adaptive cruise assist functions are unavailable or restricted.
Recommended action
Take over the required speed, distance and steering control. Check sensor visibility as instructed by the message and manual; have a persistent issue checked.
Key indication
Act immediately on a take-over or braking request. Unavailability alone does not prove sensor damage.
Adaptive cruise assist – restricted or unavailable
White · Function restricted · Symbol with message
Meaning
With a fault message, some adaptive cruise assist functions are unavailable or restricted.
Recommended action
Take over the required speed, distance and steering control. Check sensor visibility as instructed by the message and manual; have a persistent issue checked.
Key indication
Act immediately on a take-over or braking request. Unavailability alone does not prove sensor damage.
Park assist – unavailable or interrupted
White · Function restricted · Symbol with message
Meaning
With the corresponding message, automatic parking assistance is unavailable or has been interrupted.
Recommended action
Safely take over vehicle control and watch the surroundings. Follow the message and manual; have a recurring issue checked.
Key indication
This white P-with-steering-wheel symbol is distinct from the circled P parking-brake indicator.
Fatigue – break recommended · multiple meanings of the same symbol
Fatigue – break recommended
White · Information / warning depending on state · Symbol with message
Meaning
The message indicates a low estimated level of driver fatigue.
Recommended action
Stop safely and take a break. Do not continue driving while tired.
Key indication
The eye symbol does not replace the driver’s own fitness assessment. The system may miss fatigue or microsleep; responsibility remains with the driver.
Fatigue – take a break
White · Warning · Symbol with message
Meaning
The message indicates a high estimated level of driver fatigue.
Recommended action
Stop safely and take a break. Do not continue driving while tired.
Key indication
The eye symbol does not replace the driver’s own fitness assessment. The system may miss fatigue or microsleep; responsibility remains with the driver.
Fatigue warning – system limitation message
Yellow / amber · Function restricted · Symbol with message
Meaning
With a fault message, fatigue monitoring is unavailable or restricted. The eye’s colour alone does not identify the cause.
Recommended action
Assess your fitness and take breaks independently of the assistant. Retry later as instructed; arrange a check for a persistent fault.
Key indication
This explanation requires an accompanying limitation or fault message. Do not dismiss a request for a break as merely a technical fault.
Cruise control – unavailable message · multiple meanings of the same symbol
Cruise control – unavailable message
White · Function restricted · Symbol with message
Meaning
With the corresponding message, speed regulation is unavailable or restricted.
Recommended action
Control speed yourself and follow the message. Have a persistent fault professionally checked.
Key indication
This meaning applies to a fault message, not every white cruise-control status indication.
Cruise control – on, regulation inactive (white)
White · Operating information · Steady
Meaning
The white symbol without a fault message indicates cruise control switched on but not activated.
Recommended action
Cruise control is switched on but is not yet regulating speed. Maintain speed and distance yourself. Activate regulation only in suitable conditions as described in the manual; remain ready to brake and take over at any time.
Key indication
Only the cited Q4 e-tron equipment and manual edition are covered. A different message requires its own interpretation.
Traffic sign recognition – displayed speed limit
Red · Operating information · Steady
Meaning
On suitably equipped vehicles, the system displays a detected speed restriction and also evaluates available navigation data. The 120 image illustrates the displayed road sign; it is not a current or recommended speed limit here. The red rim is the sign’s normal appearance, not by itself a red fault warning.
Recommended action
Observe actual road signs and comply with applicable rules. Do not rely on the display if information is uncertain or missing; camera and navigation data can be limited or incorrect.
Key indication
Applies only to Q3 with the stated equipment and manual edition. This example without a supplementary plate does not explain restrictions for rain, fog, time or trailers. A flashing overspeed warning with an exclamation mark and unavailability messages are distinct states not depicted by this standalone image.
LIM – speed limitation active · multiple meanings of the same symbol
LIM – speed limitation active
Green · Operating information · Steady
Meaning
The limiter is switched on and actively limits speed to the set value.
Recommended action
Monitor speed yourself and obey actual road signs. The limiter does not remove the driver’s responsibility for speed; adjust speed safely yourself if limitation is interrupted or exceeded.
Key indication
Only the listed Audi editions/equipment. Other white, flashing or predictive variants require their own interpretation.
LIM flashing – set speed exceeded
Green · Information / warning depending on state · Flashing
Meaning
The set control speed has been exceeded and limitation has temporarily been manually overridden.
Recommended action
Monitor speed yourself and obey actual road signs. The limiter does not remove the driver’s responsibility for speed; adjust speed safely yourself if limitation is interrupted or exceeded.
Key indication
Only the documented green LIM inscription and listed Audi editions. Does not mean all assistants are off or an engine fault.
LIM – switched on, not limiting · multiple meanings of the same symbol
LIM – switched on, not limiting
White · Operating information · Steady
Meaning
The limiter is switched on but not activated. The inscription does not confirm active speed limitation.
Recommended action
Monitor speed yourself and obey actual road signs. The limiter does not remove the driver’s responsibility for speed; adjust speed safely yourself if limitation is interrupted or exceeded.
Key indication
Only the cited Q4 e-tron equipment and manual edition are covered. A different message requires its own interpretation.
LIM – limitation or fault message
White · Function restricted · Symbol with message
Meaning
With an accompanying message, the limiter may be unavailable or restricted. A white inscription alone may simply mean the normal inactive state.
Recommended action
Control speed yourself. Follow the message and manual; arrange a professional check if the fault persists.
Key indication
Only the cited Q4 e-tron equipment and manual edition are covered. A different message requires its own interpretation.
LIM – detected speed limit cannot currently be adopted
White · Function restricted · Symbol with message
Meaning
The specific unavailable-limit-adoption message restricts the predictive function. In this manual, limiting continues at the manually set value. It does not automatically mean the limiter is entirely switched off.
Recommended action
Check the exact message and selected speed. Choose speed yourself according to road signs; follow the manual and seek service if the issue persists.
Key indication
Only the specified Q4 e-tron 07.2024 message, not every white LIM or general limiter fault.
LIM AUTO – predictive speed limiting
Green · Operating information · Steady
Meaning
The predictive limiter actively limits speed to a detected speed limit or manually selected value. It is not the plain manual LIM state or a fault.
Recommended action
The driver is responsible for speed compliance. Actual road signs take priority; recognition or map errors can cause incorrect regulation.
Key indication
Only for documented predictive equipment in Q4 e-tron 07.2024. Automatic limit adoption and a white inactive limiter are different states.
Related advice and services: Night Vision – night vision system.
Battery and electrical system
Electrical system – red Audi warning
Red · Warning · Symbol with message
Meaning
The message indicates an electrical-system fault or a battery that is not charging. The symbol alone does not prove battery failure.
Recommended action
Stop the vehicle safely, do not continue driving and switch off the ignition. Obtain professional help as instructed.
Key indication
Applies to the cited red safe-stop or non-charging messages under the relevant manual; yellow messages have separate procedures.
Electric vehicles and plug-in hybrids
e-Sound / AVAS warning sound fault
Yellow / amber · Function restricted · Steady
Meaning
The electronic vehicle sound is not working. Other road users may not hear the approaching vehicle.
Recommended action
Drive with particular care and arrange prompt professional inspection as directed by the cited manual and any further messages.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Electric drive – reduced available power
Yellow / amber · Function restricted · Steady
Meaning
Available power is restricted and may decrease further depending on conditions. Charge level or high-voltage battery temperature may be involved; this is not an automatic diagnosis of battery failure.
Recommended action
Follow the message and power display and adapt driving to reduced acceleration. If charge is low, follow the manual and charge the battery. If safe driving is not possible, stop safely and obtain help.
Key indication
No remaining range is guaranteed. Red turtle indications have separate model-specific explanations; changing the colour does not preserve the procedure.
Q4 e-tron – limited manoeuvring only
Red · Warning · Symbol with message
Meaning
A red turtle with the corresponding message means insufficient power for normal driving, for example because of low high-voltage battery temperature or charge. While driving, vehicle immobilisation may be imminent.
Recommended action
Do not continue normal driving. Park safely as traffic permits and follow the exact message. If charge is low, arrange charging as instructed. Limited manoeuvring does not authorise continuing the journey.
Key indication
Only the cited Q4 e-tron equipment and manual edition are covered. A different message requires its own interpretation.
A/C – cabin CO₂ concentration remains elevated
Red · Warning · Symbol with message
Meaning
On the cited version, the air-conditioning message warns that cabin CO₂ concentration remains elevated.
Recommended action
Ventilate the vehicle immediately. If the message persists, do not continue driving and contact a qualified workshop. Even if it disappears, have the cause checked soon.
Key indication
This interpretation requires the stated CO₂ message. It is not the general meaning of an A/C button or an engine-coolant CO₂ test. The separate text message “Klimatisierung eingeschränkt” on the same page describes reduced cabin climate operation during increased cooling to protect the high-voltage battery. It is not this CO₂ warning and has no separately documented symbol here.
A/C – elevated cabin CO₂ concentration
Yellow / amber · Warning · Symbol with message
Meaning
On the cited version, the air-conditioning message warns of elevated cabin CO₂ concentration.
Recommended action
Ventilate the vehicle immediately. If the message persists, do not continue driving and contact a qualified workshop. Even if it disappears, have the cause checked soon.
Key indication
This interpretation requires the stated CO₂ message. It is not the general meaning of an A/C button or an engine-coolant CO₂ test. The separate text message “Klimatisierung eingeschränkt” on the same page describes reduced cabin climate operation during increased cooling to protect the high-voltage battery. It is not this CO₂ warning and has no separately documented symbol here.
Operating and information symbols
Start-stop unavailable or switched off · multiple meanings of the same symbol
Start-stop unavailable or switched off
White · Function restricted · Steady
Meaning
Automatic stop conditions are not met or the function is switched off. The symbol alone does not diagnose a fault or a defective battery.
Recommended action
Follow any accompanying message. If the vehicle explicitly reports a system fault, arrange inspection; distinguish normal unavailability from a fault.
Key indication
This is an example of an indication. Check its meaning for your specific model and equipment against the exact message and your vehicle’s owner’s manual.
Start-stop – engine not automatically stopped
White · Operating information · Steady
Meaning
Depending on engine version, the white crossed-out A can mean that conditions for automatic engine stop are not met. It does not by itself establish a fault.
Recommended action
Monitor operation and the exact message. Conditions include temperature, battery state, electrical demand and assistance systems. Arrange service for an explicit starting-system fault message; follow the manual if a manual restart is requested.
Key indication
Distinguish this state from the green stop-phase A and physical A OFF button. “Antrieb: Bitte Fahrzeug manuell starten” and “Fahrzeugstartsystem: Störung! Bitte Service aufsuchen” are different messages; the white icon alone does not distinguish them. These textual messages must not automatically be assigned to every occurrence of the white icon.
Start-stop – engine automatically stopped (green variant)
Green · Operating information · Steady
Meaning
The green symbol confirms an automatic engine stop by the start-stop system.
Recommended action
Be prepared for an automatic restart. Before leaving the vehicle, switch it off and secure it as instructed.
Key indication
Do not confuse this with the white crossed-out A, which indicates a different availability state.
Audi central warning – red message
Red · Warning · Symbol with message
Meaning
The central symbol draws attention to an accompanying message. It does not identify a system or failed component by itself.
Recommended action
Read the message immediately and follow its instructions. If STOP or a prohibition on continuing is displayed, stop safely and obtain help.
Key indication
The red triangle is not a universal engine diagnosis. The full message determines the response.
Audi central warning – amber message
Yellow / amber · Warning · Symbol with message
Meaning
The amber central symbol draws attention to an accompanying message. It does not identify a system or failed component by itself.
Recommended action
Read the message in the instrument cluster and follow it. The full message determines the required action and its urgency.
Key indication
The amber triangle is neither universal permission to continue driving nor an engine diagnosis. The full message determines the response.
MMI symbols and messages
Controls and climate
MAX – windscreen demisting and defrosting · multiple meanings of the same symbol
MAX – windscreen demisting and defrosting
White · Operating information · Control marking (not a warning)
Meaning
This climate-control icon activates windscreen demisting and defrosting using dehumidified air and a high fan setting.
Recommended action
Use as needed to maintain visibility and adjust the function after demisting as instructed. This is not by itself a fault message.
Key indication
White is the schematic control colour in the cited manual; it does not confirm activation on every display. This is a control icon, not a fault warning.
MAX with ignition off – Audi A8 residual heat
White · Operating information · Control marking (not a warning)
Meaning
In this specific context, the defrost button has another function: using coolant residual heat to warm the cabin.
Recommended action
According to the specified manual, hold the button for more than two seconds with the ignition off. The function switches off automatically after approximately 15 minutes.
Key indication
Not proof of automatic activation or a universal procedure for other climate systems. Audi A4 07.2024 uses another residual-heat control; do not transfer this procedure to it.
REAR – heated rear window
White · Operating information · Control marking (not a warning)
Meaning
This control switches rear-window heating on or off under the conditions in the manual.
Recommended action
Use as needed to maintain visibility and adjust the function after demisting as instructed. This is not by itself a fault message.
Key indication
White is the schematic control colour in the cited manual; it does not confirm activation on every display. This is a control icon, not a fault warning.
AUTO – Audi automatic climate mode · multiple meanings of the same symbol
AUTO – Audi automatic climate mode
White · Operating information · Control marking (not a warning)
Meaning
Control of automatic regulation to the selected temperature using airflow and distribution, according to the specified equipment. Not Auto Hold or an automatic gearbox.
Recommended action
Select the desired temperature and check the actual active mode. Demist sufficiently and maintain visibility if windows fog.
Key indication
The label alone proves neither a fault nor current activation. A4 uses physical controls and A8 equipment includes touch and other controls; procedures are not transferred without the manual.
AUTO with ignition off – Audi A4 residual heat
White · Operating information · Control marking (not a warning)
Meaning
With ignition off, the applicable rotary control uses coolant residual heat to warm the cabin. Not ordinary automatic climate operation while driving.
Recommended action
For the basic climate system, press rotary control 1 according to the manual; for three-zone comfort climate, press left control 1. The function switches off automatically after approximately 15 minutes.
Key indication
AUTO label and its different context are documented by the controller illustration and Restwärme paragraph. The Audi A8 MAX-hold procedure must not be transferred to this A4. The white label alone proves no activation.
A/C – air-conditioning cooling control
White · Operating information · Control marking (not a warning)
Meaning
White A/C is the cooling-mode control label. Cooling requires the fan; with cooling off, air is neither cooled nor dehumidified.
Recommended action
Set the mode following the actual climate-system manual. Restore appropriate dehumidification if windows mist; cooling can switch off automatically at low outside temperatures.
Key indication
Not the red/amber Q4 A/C cabin-CO₂ warning. A/C MAX, ECO or OFF and other graphical controls have separate meanings.
A/C MAX – maximum cooling · multiple meanings of the same symbol
A/C MAX – maximum cooling
White · Operating information · Control marking (not a warning)
Meaning
Control label for maximum cooling performance and airflow. Not the red or amber A/C warning used in other models.
Recommended action
Use briefly to avoid unnecessary energy use. In unfavourable conditions this manual warns that the mode can contribute to window misting; maintain visibility.
Key indication
The white inscription labels a control, not by itself the function’s current state. According to the manual, activation is shown by a coloured bar in the control field or an LED; availability/layout depends on equipment. Only the cited Audi A8 edition.
A/C MAX – Audi A4 maximum cooling
White · Operating information · Control marking (not a warning)
Meaning
On the basic system, A/C MAX controls rapid maximum cooling and dehumidification. On the three-zone comfort system, maximum cooling is selected with the rocker control, depending on equipment.
Recommended action
Use briefly. The described three-zone mode can contribute to misting in unfavourable conditions; choose settings that maintain visibility.
Key indication
The white schematic represents a control label, not by itself activation or a fault. Only the specified climate system and equipment.
A/C ECO – energy-saving climate mode
White · Operating information · Control marking (not a warning)
Meaning
Control for energy-saving air-conditioning operation on the specified equipment. Not confirmation of a fault, low refrigerant or a whole-vehicle drive profile.
Recommended action
Choose the mode according to cooling and visibility needs. If windows mist, adjust climate control and airflow according to the manual.
Key indication
The white inscription labels a control, not by itself the function’s current state. According to the manual, activation is shown by a coloured bar in the control field or an LED; availability/layout depends on equipment. Only the cited Audi A8 edition.
REAR – rear climate controls
White · Operating information · Control marking (not a warning)
Meaning
This label gives access to rear climate controls where equipped. REAR text alone is not the rear-window heating symbol.
Recommended action
Press REAR to access the mode; leave it using REAR or REAR MODE EXIT. The function requires the applicable rear climate-control equipment.
Key indication
The white inscription labels a control, not by itself the function’s current state. According to the manual, activation is shown by a coloured bar in the control field or an LED; availability/layout depends on equipment. Only the cited Audi A8 edition.
SYNC – climate-zone synchronisation
White · Operating information · Control marking (not a warning)
Meaning
With synchronisation enabled, temperature, air distribution and fan settings from the driver’s side are adopted for the other seats.
Recommended action
Enable when shared settings are desired. Audi A8 06.2025 also specifies a two-finger pinch on the lower display; Audi A4 07.2024 uses its own rocker selection. Procedures are not interchangeable.
Key indication
The white label identifies a control; actual climate-system indication confirms activation. Only the explicitly listed Audi editions/equipment.
OFF – Audi A8 climate system off · multiple meanings of the same symbol
OFF – Audi A8 climate system off
White · Operating information · Control marking (not a warning)
Meaning
In the specified system, climate control switches off and outside-air intake closes. Front OFF switches off front and rear; where equipped, rear OFF controls only the rear section.
Recommended action
To switch back on, use a control field on the applicable display. Maintain ventilation and visibility; restore an appropriate mode if windows mist.
Key indication
The white inscription labels a control, not by itself the function’s current state. According to the manual, activation is shown by a coloured bar in the control field or an LED; availability/layout depends on equipment. Only the cited Audi A8 edition.
OFF – Audi A4 climate system off
White · Operating information · Control marking (not a warning)
Meaning
Overall OFF switches climate control off and closes the outside-air supply. Basic and three-zone versions use different physical controls in this manual.
Recommended action
Use the relevant rotary control or OFF button. Another button/rotary control can switch the system back on. Restore an appropriate mode if windows mist.
Key indication
The white schematic represents a control label, not by itself activation or a fault. Only the specified climate system and equipment.
A/C eco – Audi A4 energy-saving cooling
White · Operating information · Control marking (not a warning)
Meaning
The three-zone comfort climate setting activates energy-saving cooling. Lowercase “eco” is this edition’s label, not a warning.
Recommended action
Select according to cooling and visibility needs using the relevant rocker control; this is not a whole-vehicle driving profile.
Key indication
The white schematic represents a control label, not by itself activation or a fault. Only the specified climate system and equipment.
A/C ON – cooling mode on
White · Operating information · Control marking (not a warning)
Meaning
On the specified three-zone system, A/C ON means cooling is switched on and automatically controlled. The fan must run; cooling may switch off automatically at low outside temperatures.
Recommended action
Select using the relevant rocker and check the actual display selection. Ensure dehumidification and sufficient airflow if windows mist.
Key indication
The white schematic represents a control label, not by itself activation or a fault. Only the specified climate system and equipment.
A/C OFF – cooling off, not the whole climate system
White · Operating information · Control marking (not a warning)
Meaning
This three-zone setting switches cooling off. Air is then neither cooled nor dehumidified; this is different from the overall OFF control.
Recommended action
Restore appropriate cooling/dehumidification and airflow if windows mist. Do not equate this setting with a refrigerant or compressor fault.
Key indication
The white schematic represents a control label, not by itself activation or a fault. Only the specified climate system and equipment.
SET REAR – adjust rear climate from the cockpit
White · Operating information · Control marking (not a warning)
Meaning
On the three-zone comfort system, rear settings can be adjusted from the front panel. Rear-panel operation is blocked during this mode; it ends after a time or on leaving the menu.
Recommended action
Select with the applicable rocker and leave the menu after adjustment. Not a rear-control fault or rear-window heating.
Key indication
The white schematic represents a control label, not by itself activation or a fault. Only the specified climate system and equipment.
Unsure what an indicator means?
When contacting the workshop, tell us the model, production year, powertrain and exact message. A photograph of the entire instrument cluster message and whether the lamp is steady or flashing will help. Take photographs only with the vehicle safely parked.
Workshop hours: Mon–Fri 9:00–18:00.
Office and bookings: +420 605 399 448
Workshop: +420 608 313 437
This is not a 24-hour breakdown service. A photograph alone is not sufficient to diagnose a fault.