What is the reason for the simultaneous illumination of the Volkswagen EPC and engine lights?

[Connie]

Volkswagen EPC and engine lights illuminate simultaneously because the EPC detects a system malfunction. Below are the specific details: EPC detects a system malfunction: When the EPC detects a system malfunction, it indicates an issue with the engine throttle adjustment system or the engine system itself. Common reasons for the fault light to illuminate include excessive carbon buildup in the throttle body, engine misfires or cylinder failures affecting throttle operation, air leaks behind the throttle body, or abnormal readings from the intake pressure sensor. Correct actions when both EPC and engine lights are on: If both the EPC and engine lights illuminate while driving, it indicates a fault in the engine system. You should immediately stop the vehicle for inspection or take it to a professional repair shop for diagnosis and repair. It is recommended to perform regular maintenance within the specified intervals rather than waiting for warning lights or issues to arise during driving.