Powertrain
generic / SAE
P2A3C
O2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 3
Voltage on the wide-band oxygen sensor negative pump current line of bank 1 sensor 3 is below the expected window. Wire shorted to ground or pump cell short.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberA / 3C
Possible causes
- Pump current wire shorted to ground high
- Internal short in pump cell 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: shop recommended
- Estimated cost: 150–700 €
- Estimated time: 0.5–3 h
- Component: oxygen sensor b1s3
- Component: wiring harness
- Component: ecm
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012