O2 Sensor Positive Current Control Circuit High (Bank 2, Sensor 1)
What does P2242 mean?
The P2242 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Positive Current Control Circuit High (Bank 2, Sensor 1). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Engine running rich
- Poor fuel economy
- Black smoke from exhaust
- Failed emissions test
Probable Causes (Ranked by Likelihood)
- Failed wideband O2 sensor with high pump cell current Very High
- Short to voltage in the positive current control wiring High
- Water or debris contamination of the sensor Moderate
- Exhaust system restriction causing abnormal backpressure Moderate
- ECM control circuit fault Low
Step-by-Step Diagnostic Procedure
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Read Bank 2 Sensor 1 air-fuel ratio and pump cell current data
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Check for wiring shorts to voltage in the pump cell circuit
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Inspect the sensor for contamination or physical damage
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Check for exhaust restrictions such as a clogged catalytic converter
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Replace the wideband O2 sensor if internal failure is confirmed
Frequently Asked Questions
What does high pump cell current indicate?
High pump cell current means the sensor is trying to compensate for a condition -- typically a rich exhaust mixture -- by pumping more oxygen into the measurement cell than normal.
Can a clogged catalytic converter cause P2242?
Yes, a restricted catalytic converter creates abnormal exhaust conditions that can affect wideband sensor operation, causing the pump cell current to go out of range.
How do I know if I have wideband or narrowband O2 sensors?
Check your vehicle's service manual. Wideband sensors typically have more wires (usually 5 or 6) compared to narrowband sensors (typically 1 to 4 wires). Most newer vehicles use wideband for upstream sensors.