OBD-II code · Powertrain (generic, extended)
P2238 O2 Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)
Pumping current at the bank 1 sensor 1 wide-band lambda probe is below the lower limit — short to ground or sensor at end of life.
Is it safe to drive with P2238?
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 ground
- PossibleWide-band sensor aged
- 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)
- P2241O2 Sensor Pumping Current Circuit Low (Bank 2 Sensor 1)
- P2235O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 2 Sensor 2)
- P2236O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 2 Sensor 3)
- P2239O2 Sensor Pumping Current Circuit High (Bank 1 Sensor 1)
- P223AReductant Heater E Control Circuit
- P223BReductant Heater F Control Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.