What causes the Audi A6L's auto start-stop failure and EPC light?

[MicahFitz]

Here are the reasons for the Audi A6L's auto start-stop failure: 1. If the Audi A6 experiences both auto start-stop failure and the EPC light illuminating simultaneously, this is due to an intermittent fault in the engine EPC system causing the auto start-stop system to malfunction. 2. Common causes for the EPC light illuminating in the Audi A6L include severe throttle body contamination, damaged throttle body or accelerator pedal, faulty brake light switch, or damaged valve lift AVS control valve. Below is an introduction to the EPC system: 1. EPC stands for Engine Electronic Power Control, commonly known as the electronic throttle system. The system mainly consists of the engine control unit, engine wiring harness, throttle body, accelerator pedal, brake switch, and clutch switch for manual transmission vehicles. 2. In the Audi A6L, aside from the above components, issues with the valve lift AVS system can also trigger the EPC fault light. Any problem detected by the engine control unit in these components will directly cause the EPC light to illuminate.