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.
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.
Common causes
- high
Pump current wire shorted to B+
One of the most commonly reported causes for this code — check this first.
Typical part cost: $170-880
- medium
Open pump cell
A plausible cause — test and verify before replacing parts.
Typical part cost: $170-880
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
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Frequently asked questions
What does P2AF1 mean?
P2AF1 means "Intake Air O2 Sensor Negative Current Control Circuit High Bank 2". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.
What are the most common causes of P2AF1?
pump current wire shorted to b+; open pump cell; connector pins corroded - high contact resistance — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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