Why does Audi a4 light epc fault light?

The reason why Audi a4 turned on the epc fault light: 1, maybe inferior gasoline was added. The throttle valve is dirty and needs cleaning. 3. The brake light is not on, so it is necessary to check the brake switch and wiring. 4. There is a leak in the air intake system, which affects the engine adjustment unit to light the epc warning light after checking the problem. 5. There is leakage in the crankcase ventilation system. It is suggested to go to 4S shop or auto repair shop for inspection and maintenance according to its specific reasons. Epc related information: 1, ElectronicPower-Control (full name of engine electronic power control system), also called electronic throttle, is composed of some sensors, controllers and other components. 2. When the engine is started, the EPC on the dashboard of the vehicle is still on, indicating that a sensor is faulty or abnormal, indicating that the mechanical and electronic systems of the vehicle are faulty.