P2626 moderate

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.

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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

Step-by-Step Diagnostic Procedure

  1. Check O2 sensor wiring and connector condition

  2. Measure O2 sensor heater circuit resistance

  3. Test O2 sensor signal with scan tool

  4. Verify ECM receives proper sensor data

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.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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