P2AE9Intake Air O2 Sensor Pumping Current Trim Circuit Open Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2AE9 is the bank 2 version of the open trim circuit: the line from the ECM to the calibration resistor of the second intake air oxygen sensor has no continuity. A separate sensor for bank 2 only makes sense where each cylinder bank draws its charge or EGR through its own path; nobody has published a vehicle that uses P2AE9. The logic follows the exhaust analog P2629, which Ford sets for Bosch probes when the pumping current in air remains too high during a fuel cut-off event; Saab rates the bank 1 twin P2626 as Type B. As the Bosch datasheet explains, the resistor in the plug fixes the sensor's characteristic curve, so a broken trim lead leaves the reading of that bank uncalibrated. A pin pushed back in the connector is a frequent finding. P2AEA/P2AEB are low/high, P2AE0 bank 1.
- What you may notice
- Check engine light on
- EGR on bank 2 reduced or without feedback
- Likely causes
- LikelyTrim contact pushed back in the plug
- PossibleTrim lead broken, often near the hot exhaust of bank 2
- RareCalibration resistor in the sensor connector 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.