P2195

P2195

Lambda correction behind cat. converter, bank 1 - rich/lean control limit exceeded

NOTE:
- Diagnosis detects a deviation between the lambda value measured by the oxygen sensor ahead of the cat. converter and the value measured by the oxygen sensor behind the cat. converter.
- The deviation is eliminated through adaptation, a fault is only set once the adaptation limits are exceeded.
- The most common fault cause is a leakage between the two oxygen sensors, resulting in the sensor behind the catalytic converter measuring more residual oxygen in the exhaust than the sensor ahead of the catalytic converter.

Diagnostic conditions
- Engine running
- Oxygen sensing in front of catalytic converter active
- No faults detected for oxygen sensor behind cat. converter

Possible fault causes
- Leakage in exhaust system between the two oxygen sensors
- Oxygen sensor in front of catalytic converter faulty (contaminated/aged)