OBD-II code · Powertrain (generic, extended)
P22AF O2 Sensor Reference Voltage Performance (Bank 1 Sensor 2)
O2 sensor reference voltage on bank 1 sensor 2 is in range but plausibility check fails — drift or instability.
Is it safe to drive with P22AF?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyReference voltage drift
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Oxygen Sensor
Related codes
- P22AEO2 Sensor Reference Voltage Circuit/Open (Bank 1 Sensor 2)
- P22BCO2 Sensor Reference Voltage Performance (Bank 2 Sensor 2)
- P22ACO2 Sensor Positive Current Control Circuit Low (Bank 1 Sensor 2)
- P22ADO2 Sensor Positive Current Control Circuit High (Bank 1 Sensor 2)
- P22B0O2 Sensor Reference Voltage Circuit Low (Bank 1 Sensor 2)
- P22B1O2 Sensor Reference Voltage Circuit High (Bank 1 Sensor 2)
- P22B2O2 Sensor Negative Current Control Circuit/Open (Bank 1 Sensor 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.