Powertrain
generic / SAE
P23BC
NOx Sensor Calibration Memory Bank 1 Sensor 3
The NOx sensor on bank 1 sensor 3 reports a calibration memory check-sum failure - factory calibration data corrupted or unreadable.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / BC
Possible causes
- Calibration memory corrupted high
- Module software outdated, reflash may resolve low
- Supply voltage outside specification low
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)
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 400–850 €
- Estimated time: 1–2 h
- Component: nox sensor b1s3
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012