P22BFO2 Sensor Negative 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
- P22BF means the negative current control lead of the bank 2 post-catalyst wide-band probe has lost continuity. That lead is the common return of pump and Nernst cell (VM/IPN on Bosch, COM on NTK); without it neither cell has a reference and the signal freezes near its bias. No maker documents this code publicly. How an open return is spotted shows in the bank 2 front code P2254: VW's 2014 Touareg data book looks for a signal of 1.47-1.52 V with cell resistance above 950 ohms, and Ford for Bosch-type probes waits for 1.45-1.55 V lasting 10 s. Chrysler lists the bank 1 twin P22B2 for the 6.7 Cummins Ram and replaces connectors first. P22C0/P22C1 are low/high, P22BB the reference lead. The lamp lights; driving feels normal.
- What you may notice
- Check engine light
- Bank 2 downstream oxygen value frozen at a constant reading
- Further codes for the same sensor may be stored together
- Likely causes
- LikelyLoose, corroded or pushed-out terminal on the return wire
- PossibleReturn wire broken by heat or vibration near the exhaust
- PossibleInternal break in the sensor lead or element
- 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.