What are the reasons for the yellow engine light in Audi Q5?

1 Answers
HaydenRose
07/29/25 10:38pm
Audi Q5 dashboard engine yellow light on reasons: 1. Sensor issues: Sensors include water temperature, crankshaft position, air flow, intake temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or signal interruption, the car's ECU cannot accurately obtain engine data, which will cause the engine fault light to illuminate. 2. Maintenance issues: Poor engine maintenance is the most common cause of engine failure. 3. Oil quality issues: Oil quality is the primary factor causing the engine fault light to illuminate. The engine has requirements for oil quality indicators, especially as various regulations impose higher demands on engines, the requirements for oil quality indicators also increase. 4. Poor mixture combustion: Engine spark plug failure, ignition coil failure, fuel pump failure, fuel line blockage, etc., can all cause poor mixture combustion in the engine. Poor mixture combustion leads to engine carbon deposits or knocking problems, which are ultimately detected by the engine's oxygen sensor and reported to the ECU, naturally triggering the fault light as a warning. 5. Intake issues: If the car's air filter is not clean and not regularly cleaned, it will affect the engine's air intake. Over time, it may become clogged, and in severe cases, it can cause the engine fault light to illuminate. After the engine fault light comes on, it is advisable to promptly go to a repair shop to check the fault code and confirm the specific reason for the yellow engine light.
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