Powertrain
generic / SAE
P225A
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 5A
Possible causes
- Sensor calibration memory corrupt 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- Module software outdated, reflash may resolve low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: hard
- DIY: shop recommended
- Estimated cost: 400–1500 €
- Estimated time: 1–3 h
- Component: nox sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012