OBD-II code · Powertrain (generic, extended)
P2AF1 Intake Air O2 Sensor Negative Current Control Circuit High Bank 2
The negative pump current control of the intake air oxygen sensor on bank 2 reports a circuit high condition. Wide-band lambda regulation on the intake side is impaired.
Is it safe to drive with P2AF1?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPump current wire shorted to B+
- PossibleOpen pump cell
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Intake Air O2 Sensor B2, Wiring Harness, Ecm
Related codes
- P2AE8Intake Air O2 Sensor Negative Current Control Circuit High Bank 1
- P2AEEIntake Air O2 Sensor Pumping Current Circuit High Bank 2
- P2AEFIntake Air O2 Sensor Negative Current Control Circuit Open Bank 2
- P2AF0Intake Air O2 Sensor Negative Current Control Circuit Low Bank 2
- P2AF2Starter Relay C Control Circuit/Open
- P2AF3Starter Relay C Control Circuit Low
- P2AF4Starter Relay C Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.