NOx Sensor Heater Sense Circuit Bank 1 Sensor 3
A general circuit fault on the heater sense feedback for the bank 1 sensor 3 NOx sensor - the line over which the ECU verifies that the heater is actually drawing current.
Affected components
- Nox sensor b1s3 heater
Common causes
- High likelihood: Open in heater sense line
Possible symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
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.