P22ADO2 Sensor Positive Current Control Circuit High (Bank 1 Sensor 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
- P22AD is the high-side fault on the positive current control line of the bank 1 downstream wide-band probe: the pump-current wire is pulled above its expected level, for example by contact with the heater feed or another supply wire. On Saab's 2010 9-5 the pump-current pins measure roughly 2.8 V at the plug, which gives a feel for the normal bias. GM lists the code in bulletin 21-NA-149 for the 3.0 Duramax LM2, again tied to engine harness chafing, but publishes no limit. Ford sends shorts to power on its upstream wide-band probes to P0132 instead of a dedicated code. The upstream analog is P2239 (Type B at Saab); P22AB is the open circuit, P22AC the low reading, P22BA the bank 2 version. The lamp is lit; driving normally feels unchanged.
- What you may notice
- Check engine light
- Downstream oxygen reading implausibly high or fixed
- Readiness monitors for catalyst or aftertreatment not completed
- Likely causes
- LikelyPump-current wire shorted to the heater supply or another positive feed
- PossibleInternal short between heater and pump cell in the sensor
- RareFaulty sensor interface in the ECM or sensor module
- 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: €50 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.