P2AE8Intake Air O2 Sensor Negative Current Control Circuit High Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2AE8 reports that, on bank 1's intake air oxygen sensor, the negative current control line sits above its intended level. For the bias on this return to climb towards battery voltage, something must feed it: most often the heater supply sharing the six-pin plug, sometimes condensate in a connector that collects moisture from the intake air. With the reference raised, the ECM loses its anchor for regulating the Nernst cell and discards the oxygen value. Ford handles a VM lead shorted to battery on exhaust probes under P0132, and the Bosch LSU 4.9 sheet lists the trim, pump and return pins side by side, which shows how close these faults sit. No manufacturer documents P2AE8 publicly. P2AE6 is the open fault, P2AE7 the low one, P2AE5 the high fault on the pump lead, P2AF1 bank 2.
- What you may notice
- Check engine light on
- EGR reduced, NOx may rise
- Likely causes
- LikelyReturn lead shorted to the heater supply
- PossibleCondensate inside the sensor connector
- RareInternal short between heater and cell
- 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.