Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / 31
Possible causes
- Open calibration trim resistor high
- Corroded sensor connector medium
- Supply wire pinched against B+ source low
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 150–600 €
- Estimated time: 0.5–2 h
- Component: oxygen sensor wideband b2s1
- Component: sensor calibration resistor
- Component: wiring harness
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012