HO2S Heater Control Circuit Range/Performance Bank 1 Sensor 2
Heater control of bank 1 sensor 2 is electrically OK but does not heat the sensor as expected — element aged or wiring resistance high.
Affected components
- Oxygen sensor b1s2
Common causes
- High likelihood: Heater element aged
- Low likelihood: Sensor element aged beyond calibration window
- Low likelihood: Sensor mounting loose - signal damping
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.