HO2S Heater Control Circuit (Bank 1 Sensor 1)
HO2S Heater Control Circuit (Bank 1 Sensor 1): the control circuit has an electrical fault. The heater brings the oxygen sensor to operating temperature for closed-loop fuel control.
Affected components
- Oxygen sensor
- Oxygen sensor heater
- Sensor wiring
Common causes
- High likelihood: Heater element open or burnt out
- Medium likelihood: Heater supply fuse blown
- Medium likelihood: Wiring or connector fault
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.