Powertrain
generic / SAE
P2AC0
Intake Air O2 Sensor Reference Voltage Circuit Range/Performance Bank 1
The reference voltage supplied to the intake air oxygen sensor on bank 1 reports a range/performance condition. Lambda measurement on the intake side is unreliable.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberA / C0
Possible causes
- Reference voltage drifted from nominal high
- High-resistance contact in connector medium
- Sensor element aged beyond calibration window 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: 200–900 €
- Estimated time: 1–4 h
- Component: intake air o2 sensor b1
- Component: wiring harness
- Component: ecm
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012