P2AE7Intake Air O2 Sensor Negative Current Control Circuit Low Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2AE7 is set when the virtual-ground return of the bank 1 intake oxygen sensor is pulled below its bias. In operation this lead sits roughly 2.5 V above chassis, as Saab's 2010 9-5 documents for its wide-band probe; a wire touching the engine block, a bracket or the intake pipe drags it towards zero. The pump cell then has hardly any room to work, and both the measured oxygen share and the EGR rate derived from it become meaningless. Ford counts a grounded VM lead among the faults that set P0131 on its exhaust probes. No manufacturer documents P2AE7 itself, so this rests on CARB's range-check duty and the Bosch pin layout. P2AE6 is the open return, P2AE8 the high case, P2AE4 the low fault on the pump lead, P2AF0 bank 2.
- What you may notice
- Check engine light on
- EGR cut back, possibly higher NOx
- Likely causes
- LikelyReturn lead chafed against engine or bracket
- PossibleInternal short of the common electrode to ground
- RareBias source in the ECM faulty
- 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.