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
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.
Mechanics Guide Step-by-step diagnosis
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
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Commonly Affected Vehicles
- 2010-2020 Toyota Tundra V8
- 2012-2019 Honda Odyssey V6
- 2008-2018 Ford F-150 V8
- 2011-2020 Chevrolet Silverado V8
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