P2631O2 Sensor Pumping Current Trim Circuit High (Bank 2 Sensor 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2631 flags a trim value above the valid window for the first wide-band probe on bank 2. Ford assigns it to NTK probe installations: the interface chip notices the resistor line pulled up to battery voltage, as from a chafed wire touching a powered circuit. GM's 2005 table for the 3.5 L V6 of Honda origin uses the mirror logic, with the bank 2 label resistor voltage below 0.29 V for 5 s. CARB requires front air-fuel ratio sensors to be checked for wiring defects and for readings beyond their valid span that would disable closed-loop fuelling, which is what such a reading does. A harness short can also hit other circuits in the same loom, so check for neighbouring codes first. Bank 1 high is P2628; P2630 is the low fault and P2629 the open fault on this probe.
- What you may notice
- Check engine light
- Lambda control on bank 2 disabled
- Possibly additional circuit codes from the same harness
- Likely causes
- LikelyBank 2 resistor line shorted to a powered wire in the harness
- PossibleBank 2 front probe with internal short
- RareNon-matching replacement probe or repaired connector without the original resistor
- 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 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.