P2AEFIntake Air O2 Sensor Negative Current Control Circuit Open Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2AEF indicates that the return line, or virtual ground, of the bank 2 intake oxygen sensor is open. Both cells of a wide-band element reference this lead, pin 2 (IPN/VM) on the Bosch LSU 4.9, which the ECM biases so current can flow both ways. Ford's 2012 summary describes the bank 2 exhaust analog P2254: if the sensor voltage settles inside a narrow band (1.45-1.55 V with the Bosch CJ125, 1.95-2.05 V with the Conti ATIC42) for 10 s, the return is judged open. Nothing comparable is published for an intake sensor, and no maker documents P2AEF. A second intake sensor exists only where every bank has a separate intake or EGR route. While the return is open, bank 2 EGR loses its feedback; drivers usually see only the lamp. P2AF0/P2AF1 are low/high, P2AEC the open pump lead, P2AE6 bank 1.
- What you may notice
- Check engine light on
- Usually no noticeable change in driveability
- Likely causes
- LikelyReturn lead (pin 2) broken
- PossibleReturn contact corroded or loose
- RareInternal break of the common electrode
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.