Powertrain
Definition only
Lights the check engine lamp
P2631: O2 Sensor Pumping Current Trim Circuit High Bank 2 Sensor 1
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P2631 mean?
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.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
- High Open calibration trim resistor
- Medium Corroded sensor connector
- Low Supply wire pinched against B+ source
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2631 on the same make and model first.
P2631 in the community
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