OBD-II code · Powertrain (generic, extended)
P2237 O2 Sensor Pumping Current Circuit (Bank 1 Sensor 1)
The pumping current line of the wide-band lambda sensor on bank 1 sensor 1 is unable to operate. Wide-band sensors regulate exhaust oxygen to a reference cell via this pumping current — without it, AFR cannot be measured.
Is it safe to drive with P2237?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPumping current line open
- PossibleWide-band sensor failed
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
- P2240O2 Sensor Pumping Current Circuit (Bank 2 Sensor 1)
- P2234O2 Sensor Signal Circuit Shorted to Heater Circuit (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)
- P2238O2 Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)
- P2239O2 Sensor Pumping Current Circuit High (Bank 1 Sensor 1)
- P223AReductant Heater E Control Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.