What about the yellow light of Audi A4L engine?

This light is called: engine fault warning light. Engine fault indicator lamp, which lights up when the ignition switch is turned on for vehicle self-inspection, and goes out when the vehicle engine starts to work. If this light is on or flashing while driving, it means that there is something wrong with the engine and it should be stopped for inspection.

Audi A4L engine yellow light has three possibilities:

1. The engine connecting line is closed.

2. If the engine vibrates when the vehicle is idling, it may be carbon deposit in the engine or foreign matter in the exhaust pipe.

3. Empty the fuel tank regularly.

If it is determined that the oil pressure, water temperature, fuel system and ignition system of the engine are normal, first turn off the main power supply, stop for a while, and then turn on the engine to see if it is still on.

If it is still on, go to the maintenance station to check the fault. When this light is on, you should be able to feel whether the power of the engine has changed significantly. If the power is affected, the engine will break down. If the power supply is not affected, it may be a small problem with the circuit or computer.

When the engine fault yellow light is on, it indicates that the engine exhaust related system is faulty. It is very common that the throttle valve is too wide or the engine exhaust valve leaks, which will lead to the alarm of the fault light.

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