What does it mean when the Volkswagen EPC light is on?

[Kenny]

EPC light on indicates a fault in the vehicle's mechanical and electronic systems. Here is the relevant introduction about EPC: Reasons for EPC light on: Fuel quality issues; If the engine stalls due to improper operation, this indicator light will also come on; Intake system failure, such as leaks or blockages; Abnormal cylinder pressure, poor operating conditions; Fault in the vehicle's computer; Occasional faults, false alarms; Dirty throttle body. When the EPC indicator light is on, ninety-five percent of the cases are due to a dirty electronic throttle body. Symptoms of EPC light on: If the light stays on or flashes after ignition or during driving, it means the management system has detected a fault in the engine or electronic system. Please contact the service station immediately. The engine must be checked immediately. In addition to the above situations, a dirty throttle valve body, vacuum leaks in the intake system, damaged brake switch, untimely engine upgrades, etc., can also cause EPC faults.