OBD-II code · Powertrain (generic)
P0064 HO2S Heater Control Circuit High Bank 2 Sensor 3
Heater control voltage of bank 2 sensor 3 above the expected range. The sensor heater warms the element to operating temperature (~600 °C); without it the lambda sensor stays inactive in closed loop and the ECM cannot trim mixture.
Is it safe to drive with P0064?
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 B2s3 Heater, Heater Wiring
Related codes
- P0044HO2S Heater Control Circuit High Bank 1 Sensor 3
- P0061HO2S Heater Resistance Bank 2 Sensor 3
- P0062HO2S Heater Control Circuit Bank 2 Sensor 3
- P0063HO2S Heater Control Circuit Low Bank 2 Sensor 3
- P0065Air Assisted Injector Control Range/Performance
- P0066Air Assisted Injector Control Circuit Low
- P0067Air Assisted Injector Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.