What Does P2239 Mean?
The PCM detects excessive current in the positive current control circuit of the Bank 1 Sensor 1 air-fuel ratio sensor. This indicates an abnormal electrical condition in the sensor's pumping cell circuit.
Common Causes
55%
Failed wide-band oxygen sensor with shorted internal circuit
25%
Shorted wiring harness or pinched wire causing short to ground
10%
Damaged sensor connector with short between pins
7%
PCM internal driver circuit failure causing overcurrent
3%
Contaminated sensor element causing excessive current draw
Diagnostic Steps
1
Disconnect air-fuel ratio sensor and inspect connector for damaged, crossed, or shorted pins
2
Check wiring harness for damage, pinch points, or shorts to ground using multimeter
3
Measure resistance of sensor at connector; compare to manufacturer specifications
4
Using scan tool, monitor sensor current draw with sensor disconnected to check for PCM issue
5
Replace air-fuel ratio sensor if all wiring tests good but code persists
Estimated Repair Cost
$200 - $650
Parts + labor, varies by vehicle and location
The PCM detects excessive current in the positive current control circuit of the Bank 1 Sensor 1 air-fuel ratio sensor. This indicates an abnormal electrical condition in the sensor's pumping cell circuit.
The most common cause of P2239 (O2 Sensor Positive Current Control Circuit High Bank 1 Sensor 1) is: Failed wide-band oxygen sensor with shorted internal circuit
Typical repair costs for P2239 range from $200 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but fuel mixture control is impaired. May cause rough idle, hesitation, poor fuel economy, and potential catalyst damage if ignored long-term.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2239 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System and Emissions Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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