Powertrain
Definition only
Lights the check engine lamp
P2239: O2 Sensor Pumping Current Circuit High (Bank 1 Sensor 1)
Standardized SAE J2012 code · P22xx — Fuel & air metering and auxiliary emission controls
What does P2239 mean?
Pumping current at the bank 1 sensor 1 wide-band lambda probe is above the upper limit — short to supply or open return path.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
- High Pump line shorted to supply
- Medium Return path to ECU open
- Low Connector pins corroded - high contact resistance
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2239 on the same make and model first.
P2239 in the community
Ask about P2239No one has posted about P2239 yet
Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.
Describe your P2239 problem