P0037

P0037

H02S Heater Control Circuit Low

Diagnostic conditions
- Battery positive voltage between 10 V and 16 V
- Engine running

Possible cause of fault
- Short circuit to ground in triggering wire
- Corrosion in connector
- Oxygen sensor faulty
- DME control module faulty

Affected terminals
DME control module, connector II, pin 7 and oxygen sensor jack after 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).