P2629
O2 Sensor Pumping Current Trim Circuit / Open Bank 2 Sensor 1
The wide-band trim resistor circuit on bank 2 sensor 1 is open. Air-fuel feedback for bank 2 cannot be calibrated, fuel control runs degraded.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
Ordered by how often each turns out to be the cause.
- Open calibration trim resistorCommon
- Open sensor connector pinPossible
Parts involved
- Oxygen Sensor Wideband B2s1
- Sensor Calibration Resistor
- Wiring Harness
P2629 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.