P22C1O2 Sensor Negative Current Control Circuit High (Bank 2 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
- P22C1 covers a return line (virtual ground) reading too high on the bank 2 post-catalyst wide-band probe: the line is pushed above the mid-level bias the controller sets, which in practice means contact with the heater supply or battery voltage, often via a melted or wet connector. With the reference raised, the rich side of the scale is lost and the oxygen value becomes useless. No maker documents this code publicly. Mitsubishi names the bank 1 front analog P2253 as a two-trip code on the 2022 Outlander, and Ford's front-probe logic books shorts to battery on any Bosch pin as P0152 for bank 2. CARB expects out-of-range detection on secondary sensors. P22BF is the open, P22C0 the low case, P22B4 bank 1. The lamp lights; the engine runs on.
- What you may notice
- Check engine light
- Bank 2 downstream reading stuck high or implausible
- Likely causes
- LikelyReturn wire touching the heater feed or another positive supply
- PossibleHeat-damaged or wet connector bridging the return to a live pin
- PossibleInternal leakage from heater to sensing cells inside the probe
- 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.