OBD-II code · Powertrain (generic, extended)
P2631 O2 Sensor Pumping Current Trim Circuit High Bank 2 Sensor 1
The wide-band trim resistor circuit on bank 2 sensor 1 reads high. Air-fuel feedback gain on bank 2 is wrong, the controller cannot compensate the offset.
Is it safe to drive with P2631?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen calibration trim resistor
- PossibleCorroded sensor connector
- Less likelySupply wire pinched against B+ source
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Oxygen Sensor Wideband B2s1, Sensor Calibration Resistor, Wiring Harness
Related codes
- P2628O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 1
- P2C64O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 3
- P262ESensor Reference Voltage G Circuit High
- P262FSensor Reference Voltage G Circuit Range/Performance
- P2630O2 Sensor Pumping Current Trim Circuit Low Bank 2 Sensor 1
- P2632Fuel Pump B Control Circuit / Open
- P2633Fuel Pump B Control Circuit Low
- P2634Fuel Pump B Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.