NOx Sensor Calibration Memory (Bank 1 Sensor 1)
The factory calibration memory of the NOx sensor on bank 1 sensor 1 cannot be read or contains a checksum error. Each NOx sensor ships with a unique calibration table programmed at the factory.
Affected components
- Nox sensor
Common causes
- High likelihood: Sensor calibration memory corrupt
- Low likelihood: Module software outdated, reflash may resolve
- Low likelihood: Supply voltage outside specification
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
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.