P2121

P2121

Diagnosis information - DME (DFI)

Throttle valve potentiometer 1 implausible

NOTE:
- Diagnosis takes place only if throttle valve potentiometer 2 has already been recognized as faulty ..
- If this fault is present, it is now detected that potentiometer 1 indicates values that deviate significantly from the calculated mass air flow.
- The vehicle is in limp home mode, i.e., the engine is running at 1,200 to 1,800 rpm and does not respond to throttle operation.

Diagnostic conditions
- Engine running

Possible fault causes
- Open circuit in wiring harness
- Short circuit to ground in wiring harness
- Short circuit to B+ in wiring harness
- Throttle valve adjusting unit faulty