P22BC
O2 Sensor Reference Voltage Performance (Bank 2 Sensor 2)
O2 sensor reference voltage on bank 2 sensor 2 is in range but plausibility check fails — drift or instability.
- 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.
- Reference voltage driftCommon
Parts involved
- Oxygen Sensor
P22BC 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.