Powertrain
generic / SAE
P0042
HO2S Heater Control Circuit Bank 1 Sensor 3
Generic electrical fault in the heater control of the bank 1, sensor 3 oxygen sensor (typically a third sensor downstream of multi-stage cat or NOx trap).
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number– / 42
Possible causes
- Heater element open high
- Heater wiring or connector fault medium
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–400 €
- Estimated time: 0.5–2 h
- Component: oxygen sensor b1s3 heater
- Component: heater wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012