P22C0O2 Sensor Negative Current Control Circuit Low (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
- P22C0 flags the negative current control line (virtual ground) of the bank 2 downstream wide-band probe as too low. The controller deliberately lifts this return above chassis ground, around 2.5 V on Saab's 2010 9-5, which lets the pump cell be driven both ways; once the wire touches ground, that bias and the lean side of the measuring range disappear. No maker documents this code publicly. Mitsubishi lists the bank 1 front analog P2252 as a two-trip code on the 2022 Outlander without giving a limit, and Ford reports shorts to ground on the VM pin of its front bank 2 probes as P0151 rather than a dedicated code. P22BF is the open, P22C1 the high reading, P22B3 bank 1. Apart from the lamp, little changes for the driver.
- What you may notice
- Check engine light
- Bank 2 downstream reading cannot show lean values
- Readiness for catalyst and oxygen sensor monitors stays open
- Likely causes
- LikelyReturn wire chafed against body or exhaust bracket, shorted to ground
- PossibleInternal short from the sensor return to the housing
- RareFaulty bias supply in the engine control 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.