Dashboard warning lights on an Audi are never random. Whether you drive an A3, A4, A6, Q5 or RS model, each warning follows a strict color logic: red means stop immediately, orange indicates a fault requiring fast diagnosis, while green and blue confirm system operation.
The color code – fundamentals
Audi uses a standardized visual language: red = immediate shutdown, orange = technical fault, green/blue/white = information only. This logic applies across all Audi models: A1, A3, A4, A5, A6, A7, A8, Q2, Q3, Q5, Q7, Q8, TT and RS ranges.
Red warning lights — immediate danger
Low Oil Pressure
Meaning:
Fault detected in the engine management or emissions control system. Common on Audi TFSI and TDI engines due to EGR clogging, lambda sensor failure, boost leaks, NOx sensor or AdBlue system issues.
What to do:
If the light is steady, drive moderately and scan as soon as possible.
If the light flashes, reduce speed immediately and stop to prevent catalytic converter damage.
Diagnosis:
OBD scan for exact fault codes (P-codes). Check ignition coils, spark plugs, MAF/MAP sensors, intake leaks, EGR operation and emissions-related components.
Engine Overheating
Meaning:
Engine lubrication pressure is insufficient. On Audi EA888 engines this is often related to oil pump failure, clogged pickup or pressure sensor faults.
What to do:
Stop the engine immediately. Do not restart.
Diagnosis:
Measure real oil pressure mechanically. Inspect oil pump, pickup strainer, oil level and pressure sensor wiring
Common on EA888 engines due to thermostat housing leaks or electric water pump failure. Stop immediately to avoid head gasket damage.
Brake System Failure
Can indicate low brake fluid, hydraulic leaks or electronic parking brake malfunction. Driving further may result in total brake loss.
Airbag / SRS Failure
Indicates that airbags or seatbelt pretensioners are inactive or unstable. Audi vehicles require ODIS or VCDS diagnostics to isolate the faulty circuit.
Battery / Charging System
Failure of alternator, battery management module or belt drive system. Expect power steering and safety systems to shut down progressively.
Orange warning lights — faults to treat rapidly
Check Engine Light
On Audi TDI models: EGR clogging, DPF saturation or AdBlue system faults. On TFSI engines: lambda sensors, misfires or intake leaks.
Gearbox Malfunction
Meaning:
The transmission control unit has detected abnormal operation of the automatic gearbox.
What to do:
If the vehicle enters limp mode or displays limited gear availability, drive gently and avoid hard acceleration. If gear engagement becomes erratic, stop the vehicle to prevent internal damage and arrange diagnosis.
Diagnosis:
Scan the transmission control module with ODIS or VCDS to retrieve fault codes and live data.
On Audi S-tronic and Tiptronic gearboxes, this typically relates to mechatronic unit faults, clutch adaptation errors, solenoid valve failure, overheating, or hydraulic pressure irregularities.
ABS / ESC
Wheel speed sensors, steering angle sensors or ABS control unit failures disable stability control but retain basic braking.
Tire Pressure Monitoring
Often triggered after wheel changes or gradual pressure loss. Reset the TPMS via MMI after inflating tires.
Brake Pad Wear
Audi brake pad sensors trigger once friction material reaches critical thickness. Immediate replacement avoids disc damage.
Adaptive Suspension / Air Suspension Fault
Audi air suspension failures involve leaking struts, weak compressors or faulty ride height sensors. Vehicle may sag after parking.
Glow Plug System
Applies to TDI engines. Faulty glow plugs cause rough cold starts and excessive emissions.
Green, blue and white indicators
These lights simply confirm system operation — headlights, driver assistance, lane keeping and cruise control functions.
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