Audi A4L throttle failure.

EPC is called engine electronic throttle system, commonly known as electronic throttle system. The system is mainly composed of engine control unit, engine wiring harness, throttle, accelerator pedal, brake switch and manual transmission clutch switch.

If the epc light is on, the common causes of vehicle jitter are: too much carbon deposit in the throttle valve, and the opening angle is problematic. Due to engine misfire and cylinder missing, the throttle valve is not working properly. Air leaks behind the throttle valve, and the detection data of the intake pressure sensor is abnormal. These conditions will light the EPC lamp.

If the above problems occur, you can stop the car, turn off the ignition switch and restart the engine. If the fault light goes out, it is an accidental fault. You can continue driving and drive the vehicle to the maintenance agency for maintenance as soon as possible.

If the fault indicator does not go out after restarting the engine, it proves that the fault still exists. You can drive in the same place or at a low speed. If the refueling door does not respond, it is recommended not to drive as much as possible. If the throttle and engine acceleration are normal, you can continue driving and drive the car to the maintenance agency for maintenance as soon as possible.