Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 38
Possible causes
- Pump line shorted to ground high
- Wide-band sensor aged medium
- Connector pins corroded - high contact resistance low
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