Aging of Oxygen Sensor After TWC Bank 1 Above/Below Limit

P0139 - AGING OF OXYGEN SENSOR AFTER TWC BANK 1 ABOVE/BELOW LIMIT

Diagnosis conditions
- Air mass between 25 kg/h and 120 kg/h
- Oxygen sensing after TWC is active
- Basic adaptation has reached steady condition
- No secondary air diagnosis
- No fuel tank ventilation diagnosis
- EVAP canister not highly loaded
- No faults in memory

Possible fault cause
- Implausible signal from oxygen sensor

Diagnosis/Troubleshooting

Steps 1 - 2: