P2196

P2196

Diagnosis information - DME V6 DFI

Oxygen sensor ahead of catalytic converter, bank 1 - signal too rich/lean

NOTE:
- Diagnosis detects a deviation between the lambda value measured by the oxygen sensor ahead of the catalytic converter and the value measured by the oxygen sensor behind the catalytic 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
- Lambda control ahead of catalytic converter active
- No faults detected for oxygen sensor or oxygen sensor heater ahead of or behind catalytic converter
- No fault for secondary air injection, catalytic converter or tank vent entered
- Exhaust temperature between 350 °C and 870 °C (662 °F and 1,598 °F)

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