Diagnosis/troubleshooting - all turbo models
NOTE:
- The DTC here covers the coupling of oxygen sensor heating into the sensor signal.
Diagnostic conditions
- Vehicle at operating temperature, then 3 minutes idle speed followed by 30 seconds increased idle speed
Possible cause of fault
- Short circuit in oxygen sensor wiring
- Oxygen sensor faulty (heater coupling or heating)
- DME control module faulty
Affected terminals
DME control module connector II, pin 9 and oxygen sensor connector after catalytic converter, bank 1, pin 5
DME control module connector II, pin 15 and oxygen sensor connector after catalytic converter, bank 1, pin 1
Diagnosis/troubleshooting - all turbo models
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).