P2271

P2271

Diagnosis information - Control unit DME (DFI)

Oxygen sensor behind catalytic converter Bank 1 - Signal too lean / too rich

NOTE:
Separated plug connection = open reference-air duct.
Damage to oxygen sensor.

- DO NOT use spray, grease, fluid or similar products on the oxygen sensor plug connections.

INFORMATION
- Do not interchange the oxygen sensor in front of the catalytic converter with the sensor behind the catalytic converter as this will result in implausible fault entries.
- The plugs themselves are coded and cannot be interchanged.

Diagnostic conditions
- --> Perform all short tests in sequence (without Tank tightness).
or
- steady driving > 20 Minute(s) , at:
- approx. 80 km/h
- in the highest gear
- Lambda control (Behind catalytic converter) Active

Possible fault causes
- Exhaust system leaks between Oxygen sensor in front of catalytic converter and Oxygen sensor behind catalytic converter Bank 1
- Short circuit to B+/ground/between lines or open circuit in the lines
- Oxygen sensor behind catalytic converter Bank 1 Faulty

Fault setting condition(s)
- The oxygen sensor signal deviates by a certain value from the control value (rich/lean mixture) within a certain time.