P2AE3Intake Air O2 Sensor Pumping Current Circuit Open Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2AE3 reports a break in the pumping current lead of the bank 1 intake oxygen sensor, pin 1 of a Bosch LSU 4.9 (APE/IP). Through this wire the ECM drives current into the pump cell while the Nernst cell is kept on its set point; Ford's patent US9441564B2 explains that the size of that current reflects the oxygen share of the charge, from which the EGR dilution is calculated. With the lead open, no current flows and the reading freezes. For the exhaust twin P2237 Ford detects this when reference-current pulses shift lambda by 0.05 or less within 20 s. In the intake, where the gas always stays lean, such a test would have to rely on EGR changes instead; no manufacturer publishes P2AE3 to confirm how. P2AE4/P2AE5 are low/high, P2AE6 the open return, P2AEC bank 2.
- What you may notice
- Check engine light on
- EGR runs without sensor feedback or is switched off
- Likely causes
- LikelyPump current lead (pin 1) broken
- PossibleSensor plug loose or not latched
- RarePump cell inside the sensor open
- 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.