Powertrain
generic / SAE
P2B8C
Intake Air O2 Sensor Heater Control Circuit Range/Performance Bank 1
The heater current of the intake air O2 sensor on bank 1 does not match the commanded value within tolerance.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberB / 8C
Possible causes
- Heater element resistance drifted high
- High-resistance contact in connector medium
- Sensor element aged beyond calibration window low
Symptoms
- Check engine light on after several drive cycles
- Slightly increased fuel consumption during cold start
- Delayed entry into closed-loop fuel control
- Failed emissions inspection (lambda readiness)
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 150–800 €
- Estimated time: 0.5–3 h
- Component: intake air o2 sensor b1
- Component: intake air o2 sensor heater b1
- Component: wiring harness
- Component: ecm
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012