P2630
O2 Sensor Pumping Current Trim Circuit Low Bank 2 Sensor 1
The wide-band trim resistor circuit on bank 2 sensor 1 reads low. Air-fuel feedback gain on bank 2 is wrong, causing rich or lean offsets.
- 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.
- Short in the calibration trim resistorCommon
- Water intrusion in the sensor connectorPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Oxygen Sensor Wideband B2s1
- Sensor Calibration Resistor
- Wiring Harness
P2630 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.