O2 Sensor Negative Current Control Circuit Intermittent (Bank 2, Sensor 1)
What does P2255 mean?
The P2255 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Negative Current Control Circuit Intermittent (Bank 2, Sensor 1). This is a moderate severity code.
Common Symptoms
- Intermittent Check Engine Light
- Sporadic air-fuel ratio fluctuations
- Occasional hesitation
- Intermittent rough idle
- Inconsistent emissions performance
Probable Causes (Ranked by Likelihood)
- Loose connection at the wideband O2 sensor connector Very High
- Partially broken wire in the negative current control circuit High
- Corroded pins causing intermittent contact Moderate
- O2 sensor with intermittent internal pump cell failure Moderate
- Vibration-induced wiring issues Low
Step-by-Step Diagnostic Procedure
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Wiggle test the sensor connector while monitoring pump cell current data
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Inspect the negative current control wiring for chafing or breaks
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Clean connector pins and check for secure fit
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Monitor pump cell current during a road test for intermittent drops
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Replace the wideband O2 sensor if wiring is confirmed good
Frequently Asked Questions
Why does the negative current control drop intermittently?
Intermittent pump cell current issues are usually caused by a loose or corroded connector, or by a wire that has been partially damaged and only fails under vibration or heat.
Can I use a scan tool to catch an intermittent fault?
Yes, monitoring the pump cell current data during a road test with a scan tool that can graph live data is the best way to catch intermittent dropouts.
Will cleaning the connector fix P2255?
If corrosion is the cause, cleaning the pins and applying dielectric grease may resolve the issue. However, if the wire is broken or the sensor is failing internally, further repair or replacement is needed.