HO2S Heater Resistance Bank 1 Sensor 1
The heater resistance of the bank 1, sensor 1 oxygen sensor is outside its specified range. Sensor heater aging or short between heater and signal.
Affected components
- Oxygen sensor b1s1
Common causes
- High likelihood: Heater element aged, resistance high
- Medium likelihood: Oxygen sensor failed
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.