Oxygen Sensor Heating Ahead of TWC, Bank 1 - Below Limit

P0031

Oxygen Sensor Heating Ahead of TWC, Bank 1 - Below Limit

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

Possible fault cause
- Short circuit to ground

Affected terminals
II/19

Diagnosis/Troubleshooting

NOTE: Do not use contact spray on the connectors to oxygen sensor.

Work Instructions 1 - 3:

NOTE: Do not exchange oxygen sensors ahead of catalytic converter and after catalytic converter.

Oxygen sensors ahead of and after catalytic converter







1 - Oxygen sensor ahead of catalytic converter
2 - Oxygen sensor after catalytic converter