OBD-II code · Powertrain (generic)
P0044 HO2S Heater Control Circuit High Bank 1 Sensor 3
Heater control voltage of the bank 1, sensor 3 oxygen sensor is above the expected range — short to power or open ground.
Is it safe to drive with P0044?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyHeater wiring shorted to battery
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oxygen Sensor B1s3 Heater, Heater Wiring
Related codes
- P0064HO2S Heater Control Circuit High Bank 2 Sensor 3
- P0041O2 Sensor Signals Swapped Bank 1 Sensor 2/Bank 2 Sensor 2
- P0042HO2S Heater Control Circuit Bank 1 Sensor 3
- P0043HO2S Heater Control Circuit Low Bank 1 Sensor 3
- P0045Turbocharger/Supercharger Boost Control A Circuit/Open
- P0046Turbocharger/Supercharger Boost Control A Circuit Range/Performance
- P0047Turbocharger/Supercharger Boost Control A Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.