O2 Sensor Positive Current Control Circuit High (Bank 2, Sensor 1)
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.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $150 - $400 (parts and labor)
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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
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.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Read Bank 2 Sensor 1 air-fuel ratio and pump cell current data
-
Check for wiring shorts to voltage in the pump cell circuit
-
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
Sources 1
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)
Commonly Affected Vehicles
- 2008-2018 Toyota Sienna V6
- 2009-2019 Honda Accord V6
- 2010-2020 Nissan Maxima
- 2011-2019 Dodge Durango V6
- 2012-2020 Ford Explorer V6
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