Oxygen Sensor After TWC, Bank 1 - Above Limit

P0138

Oxygen Sensor After TWC, Bank 1 - Above Limit

Diagnosis conditions
- Exhaust temperature between 250 °C and 750 °C
- Battery positive voltage greater than 9.5 V
- 200 seconds after start

Possible fault cause
- Short circuit to B+ in signal wire

Affected terminals
- II/17

Diagnosis/Troubleshooting

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

Work Instruction 1 - 3:

NOTE:
- Faults are recorded in these tests. Erase the fault memory.
- Do not exchange oxygen sensors ahead of catalytic converter and after catalytic converter.




Oxygen sensors ahead of and after catalytic converter