What if the Passat engine fault light is on and the computer shows the throttle position?

This fault means that the fault of the throttle position sensor or its circuit will have a great impact on the engine, affecting the working conditions such as acceleration and idling, and needs to be checked in time.

Detection method: You can connect a diagnostic instrument to read the data stream to see whether the throttle position signal changes and whether the throttle valve acts. You can also throttle the valve manually to see if its data can change normally.

Make sure it can't change normally, and check the related lines with a multimeter.

Replace the throttle body assembly if necessary.