Powertrain
generic / SAE
P0043
HO2S Heater Control Circuit Low Bank 1 Sensor 3
Heater control voltage of the bank 1, sensor 3 oxygen sensor is below the expected range — short to ground or low-resistance fault.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number– / 43
Possible causes
- Heater wiring shorted to ground high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
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