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.
Affected components
- Oxygen sensor b1s3 heater
- Heater wiring
Common causes
- High likelihood: Heater wiring shorted to battery
- Low likelihood: Connector pins corroded - high contact resistance
- Low likelihood: Supply wire pinched against B+ source
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.