P22C2O2 Sensor Pumping Current Trim Circuit/Open (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
- P22C2 reports an open trim line on the bank 2 downstream wide-band probe. Every probe ships with a calibration resistor in its plug (pin 5, RT/IA on a Bosch LSU) that corrects for spread in its diffusion gap; on Bosch probes it sits in parallel with the controller's sense resistor. Ford explains that if it opens, all pump current is forced through that measuring resistor, tilting the lambda curve, a small error near stoichiometry. No maker documents P22C2 publicly. Upstream on bank 2 it is P2629: VW's 2014 Touareg triggers above 4.81 V, Saab tests P2626 during overrun below 750 C, and Ford bulletin 17-2124 replaces the front probes of the 3.5 GTDI for P2626/P2629. P22C3/P22C4 are low/high, P22B5 bank 1. The lamp lights.
- What you may notice
- Check engine light
- Bank 2 downstream lambda reads slightly off, most visibly away from lambda 1
- Likely causes
- LikelyCorroded or loose trim-resistor terminal in the sensor plug
- PossibleTrim resistor or its lead open inside the sensor connector
- RareTrim wire broken between connector and 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: €0 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.