P22C4O2 Sensor Pumping Current Trim Circuit High (Bank 2 Sensor 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P22C4 is the high fault on the trim circuit of the bank 2 downstream wide-band probe. In Ford's key-on check of NTK label resistors, an estimated resistance that is too low means the line is shorted to power, which sets the trim-high code (P2631 for the bank 2 front probe); the stored resistor rank then stays in use. On Bosch-type probes a raised trim voltage looks much like an open: Saab and VW both trip their front trim code above 4.81 V, so makers may sort this fault into the open-circuit code. No maker documents P22C4 publicly, and GM's bank 1 slot P22B7 serves a NOx sensor oxygen ceiling with no bank 2 counterpart. Typical causes are a short to the heater feed or a damaged plug. P22C2 is the open, P22C3 the low case. The lamp lights.
- What you may notice
- Check engine light
- Bank 2 downstream lambda slightly off; heater codes may accompany it
- Likely causes
- LikelyTrim wire shorted to the heater supply or another positive feed
- PossibleHeat- or water-damaged sensor plug bridging the trim pin
- RareInternally shorted label resistor in the sensor connector
- 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.