P2271

P2271

Diagnosis information - DME V8 DFI

Oxygen sensor downstream, bank 1 - signal too lean / rich

NOTE:
This fault is detected if the oxygen sensor signal upstream deviates by a certain value from the control value (rich/lean mixture) within a certain time.
Diagnosis is initiated by fault detection in the mixture control.

Diagnostic conditions
- Relatively long drive in various operating states
- Diagnoses >Electrical fault of oxygen sensor downstream [or] Lambda correction downstream< must have taken place

Possible fault causes
- Leak in exhaust system between the two oxygen sensors on bank 1
- Oxygen sensor downstream, bank 1, faulty