OBD-II code · Powertrain (generic, extended)
P2239 O2 Sensor Pumping Current Circuit High (Bank 1 Sensor 1)
Pumping current at the bank 1 sensor 1 wide-band lambda probe is above the upper limit — short to supply or open return path.
Is it safe to drive with P2239?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPump line shorted to supply
- PossibleReturn path to ECU open
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oxygen Sensor Wideband, Oxygen Sensor Wiring
Related codes
- P2237O2 Sensor Pumping Current Circuit (Bank 1 Sensor 1)
- P2242O2 Sensor Pumping Current Circuit High (Bank 2 Sensor 1)
- P2236O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 2 Sensor 3)
- P2238O2 Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)
- P223AReductant Heater E Control Circuit
- P223BReductant Heater F Control Circuit
- P223CO2 Sensor Pumping Current Range/Performance (Bank 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.