HO2S Heater Control Circuit Bank 1 Sensor 3
Generic electrical fault in the heater control of the bank 1, sensor 3 oxygen sensor (typically a third sensor downstream of multi-stage cat or NOx trap).
Affected components
- Oxygen sensor b1s3 heater
- Heater wiring
Common causes
- High likelihood: Heater element open
- Medium likelihood: Heater 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.