P0056

P0056

H02S Heater Control Circuit

Diagnosis/troubleshooting

Diagnostic conditions
- Engine running

Possible cause of fault
- Open circuit
- Oxygen sensor faulty
- DME control module faulty

Affected terminals
DME control module, connector II, pin 1 and oxygen sensor jack after catalytic converter, bank 2, 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).