P0030

P0030

H02S Heater Control Circuit

NOTE: The diagnosis for this fault is different for models with turbo engines and models with naturally-aspirated engines.

Diagnosis/troubleshooting - all turbo models

Diagnostic conditions
- Battery voltage between 9.5 V and 16V
- Time elapsed after engine start-up greater than 10 seconds

Possible cause of fault
- Open circuit

Affected terminals
DME control module, connector II, pin 19 and oxygen sensor jack ahead of catalytic converter, bank 1, 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).







Diagnosis/troubleshooting - all naturally-aspirated models

Diagnostic conditions
- Engine running

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).