Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 37
Possible causes
- Pumping current line open high
- Wide-band sensor failed medium
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 120–600 €
- Estimated time: 0.5–2 h
- Component: oxygen sensor wideband
- Component: oxygen sensor wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012