P2630
O2 Sensor Pumping Current Trim Circuit Low Bank 2 Sensor 1
Oxygen / air-fuel sensor
Generic OBD-II
Low
What it means
P2630 means low voltage on the pumping-current trim (reference) circuit of the bank 2, sensor 1 wide-band air-fuel/oxygen sensor. It mainly affects the accuracy of fuel control and emissions monitoring, not whether the engine runs.
Low
Can I keep driving? Generally safe to drive. This is an upstream air-fuel sensor calibration circuit — expect at most a slightly rough idle or minor economy loss, not a breakdown.
Common symptoms
What you'll notice
- Check-engine light on
- Slightly rough or uneven idle
- Minor drop in fuel economy
- May fail an emissions test
Common causes
Most likely first
- Open or shorted wiring on the bank 2 sensor 1 air-fuel/O2 circuitLikely
- Corroded or loose sensor connectorCommon
- Swapped upstream O2 sensor connectors from a previous repairCommon
- Faulty bank 2 sensor 1 air-fuel/O2 sensorLess often
- Faulty ECMLess often
How to diagnose & fix
Work through it in order
- If the car was recently serviced, confirm the upstream O2 connectors weren't swapped between banks.
- Inspect the bank 2 sensor 1 connector and wiring for damage or corrosion.
- Check the sensor's reference and ground circuits against spec.
- Replace the bank 2 sensor 1 air-fuel/O2 sensor if it tests faulty.
- If wiring and sensor are good, suspect the ECM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2630?+
Yes. It mainly affects emissions and fine fuel control, so it's fine to drive to a shop — just don't ignore it long-term.
Can I just clear P2630?+
You can, but it returns until the sensor circuit is repaired.
Related codes
Often seen with P2630
Read & clear P2630 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX