P2C65
O2 Sensor Out of Range During Deceleration Bank 1 Sensor 3
The wide-band oxygen sensor on bank 1 sensor 3 reports a out of range during deceleration condition. Lambda regulation accuracy is impaired.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
Ordered by how often each turns out to be the cause.
- Sensor unable to follow oxygen spike during fuel cutCommon
- Sensor response time degraded with agePossible
Parts involved
- Oxygen Sensor B1s3
- Wiring Harness
- ECM
P2C65 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.