P22B8O2 Sensor Positive Current Control Circuit/Open (Bank 2 Sensor 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P22B8 is the bank 2 version of an open positive current control line on a downstream wide-band probe: the pump-current wire (IP/APE on Bosch) of the sensor behind the catalyst or aftertreatment on the second cylinder bank has lost continuity. It only exists on engines with two exhaust banks and a wide-band probe after each catalyst, which is rare. No maker documents this code publicly. Its bank 1 twin P22AB appears in Chrysler bulletins for the 6.7 Cummins Ram; for the upstream P2240, Ford separates an open pump lead from an open return by pulsing a reference current and checking whether lambda moves by more than 0.05. P22B9/P22BA are low/high, P22BB the reference line. The warning lamp is the main sign.
- What you may notice
- Check engine light
- Bank 2 downstream oxygen value missing or frozen
- Likely causes
- LikelyLoose or corroded pump-current terminal in the sensor connector
- PossiblePump-current wire broken near the hot exhaust
- PossibleInternal open circuit in the bank 2 downstream sensor
- 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 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.