O2 Sensor Pumping Current Trim Circuit Low Bank 2 Sensor 1
The P2630 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Pumping Current Trim Circuit Low Bank 2 Sensor 1. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $150 - $500 (parts and labor)
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Common Symptoms
- Bank 2 running rich
- Higher fuel consumption
- Black smoke from exhaust
- Bank 2 spark plugs fouling
Probable Causes (Ranked by Likelihood)
- Bank 2 wideband O2 sensor failure Very High
- Short to ground in bank 2 sensor circuit High
- Exhaust leak on bank 2 before sensor Moderate
- Bank 2 sensor contaminated Low
Step-by-Step Diagnostic Procedure
-
Monitor bank 2 O2 pumping current data
-
Check bank 2 sensor wiring for ground shorts
-
Inspect bank 2 exhaust manifold for leaks
-
Compare bank 2 sensor readings to bank 1
Frequently Asked Questions
Why are only bank 2 spark plugs fouling?
The faulty bank 2 O2 sensor causes the ECM to add excess fuel only to bank 2 cylinders, fouling those plugs while bank 1 remains normal.
Can I swap bank 1 and bank 2 sensors to test?
If the sensors are the same part number, swapping them can confirm whether the fault follows the sensor or stays with the wiring.
How do I identify bank 2 on my engine?
Bank 2 is the side of the engine that does not contain cylinder 1. Consult your vehicle service manual for the specific cylinder numbering.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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