BMW co-pilot relay jump.

1, one or more cylinders are not working properly.

2. The sensor (such as air flow meter) is damaged.

3. Actuator (such as fuel injector and throttle valve) is damaged.

4. When it is added to inferior gasoline or 93 # gasoline, the light is on.

Solution: The fault code must be diagnosed by computer before it can be determined what kind of fault it is and whether to replace the accessories.