O2 Sensor Pumping Current Trim Circuit Open Bank 1 Sensor 1
The P2626 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Pumping Current Trim Circuit Open Bank 1 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
- Check engine light on
- Reduced fuel economy
- Possible rough idle
- Failed emissions test
Probable Causes (Ranked by Likelihood)
- Failed wideband oxygen sensor Very High
- Open wiring in O2 sensor heater or signal circuit High
- ECM O2 sensor driver failure Moderate
- Corroded O2 sensor connector Low
Frequently Asked Questions
What is a pumping current trim circuit?
Wideband O2 sensors use a pumping current to measure oxygen levels. The trim circuit adjusts this current for accuracy. An open circuit means the sensor cannot function.
Is P2626 a regular O2 sensor code?
P2626 is specific to wideband (air-fuel ratio) sensors, which are more complex than traditional narrow-band O2 sensors.
Can I use a regular O2 sensor as a replacement?
No. Wideband sensors are specific to the vehicle and cannot be interchanged with narrow-band sensors. Use the exact replacement part.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Check O2 sensor wiring and connector condition
-
Measure O2 sensor heater circuit resistance
-
Test O2 sensor signal with scan tool
-
Verify ECM receives proper sensor data
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 Camry
- 2012-2019 Honda Civic
- 2008-2018 Ford F-150
- 2011-2020 Chevrolet Silverado
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