O2 Sensor Negative Current Control Circuit Open (Bank 2, Sensor 1)
What does P2250 mean?
The P2250 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Negative Current Control Circuit Open (Bank 2, Sensor 1). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Poor fuel economy
- Rough idle
- Failed emissions test
- Engine running rich or lean
Probable Causes (Ranked by Likelihood)
- Failed wideband O2 sensor with open negative pump cell circuit Very High
- Open circuit in the negative current control wiring High
- Corroded connector at the wideband O2 sensor Moderate
- Heat-damaged wiring near exhaust components Moderate
- ECM negative current control driver failure Low
Step-by-Step Diagnostic Procedure
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Check for open circuits in the negative current control wiring
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Inspect the Bank 2 Sensor 1 connector for corrosion or damage
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Measure resistance in the negative pump cell circuit
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Check the wiring for heat damage near the exhaust manifold
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Replace the wideband O2 sensor if internal circuits have failed
Frequently Asked Questions
What is the negative current control circuit?
In a wideband O2 sensor, the negative current control circuit works opposite to the positive current circuit. Together they manage the pump cell to accurately measure air-fuel ratios across a wide range.
How is P2250 different from P2240?
P2240 relates to the positive current control circuit, while P2250 relates to the negative current control circuit. Both are part of the wideband sensor's pump cell system.
Can I use a narrowband sensor instead of wideband?
No, if your vehicle uses a wideband sensor, you must replace it with the same type. Narrowband sensors cannot provide the precise air-fuel ratio data the ECM requires.