15 Passat eps light is on, engine fault light is on, idle speed is unstable, and idle speed suddenly rises.

15 Passat eps light is on, the engine is not on, the idle speed is unstable, and the reason for the sudden increase of idle speed is:

1, which is caused by dirty throttle body, can only be solved by cleaning the throttle and re-matching.

2. There is a leak in the air intake system, which causes the engine control unit to light the eps warning light after detecting the problem.

3. The failure of the brake light switch will also lead to this phenomenon.

4. Too much carbon deposit in the throttle or engine, and the imbalance of the mixture ratio caused by the failure of the oxygen sensor will also lead to this phenomenon.