P2AE7 code meaning
Intake Air O2 Sensor Negative Current Control Circuit Low Bank 1
Powertrain system Generic code P2Axx codes Check engine light
What P2AE7 means
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.
P2AE7 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2AE7
- Check engine light on
- EGR cut back, possibly higher NOx
Common causes of P2AE7
- Most likelyReturn lead chafed against engine or bracket
- PossibleInternal short of the common electrode to ground
- Less likelyBias source in the ECM faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Intake air O2 sensor b1Wiring harnessECM
What each part of P2AE7 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| A | Area: hybrid propulsion. |
| E7 | The exact fault in that area. |
What to do next
- Note P2AE7 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2AE7
What does P2AE7 mean?
P2AE7 means "Intake Air O2 Sensor Negative Current Control Circuit Low Bank 1". P2AE7 is set when the virtual-ground return of the bank 1 intake oxygen sensor is pulled below its bias. It is a generic code, so it means the same on every make.
Is it safe to drive with P2AE7?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2AE7 fail an emissions test?
Yes, it can. P2AE7 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2AE7 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2AE7 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.