Diagnosis/troubleshooting - all turbo models
NOTE:
- This fault can be detected in two different operating states. To find out whether the fault was recorded under load or with inertia fuel shutoff, refer to the extended fault memory.
Diagnostic conditions for fault detection under load
- Mass air flow above 16 kg/h
- No other oxygen sensor faults
- Battery positive voltage between 10 V and 16 V
Diagnostic conditions for fault detection with inertia fuel shutoff
- Exhaust temperature above 250°C
- Battery positive voltage greater than 10 V
- Time elapsed after start-up greater than 60 seconds
- No oxygen sensor faults
- Inertia fuel shutoff for more than 4 seconds
Possible cause of fault
- Open circuit
- Oxygen sensor faulty (heating)
- DME control module faulty
Affected terminals
DME control module, connector II, pin 13 and oxygen sensor jack ahead of catalytic converter, bank 2, pin 4
Diagnosis/troubleshooting
NOTE:
- Do not use contact spray on the oxygen sensor plug connections as this may cause irreparable damage to the wiring (contamination of the oxygen sensor via the reference air channel).