Possible cause of fault
- Resistance of oxygen sensor heating too high
- Open circuit
- Oxygen sensor faulty
- DME control module faulty
Affected terminals
DME control module, connector II, pin 19 and oxygen sensor jack ahead of catalytic converter, bank 1, pin 2
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).
P0031
P0031
H02S Heater Control Circuit Low