Powertrain
generic / SAE
P224B
NOx Sensor Heater Resistance (Bank 1 Sensor 2)
The measured heater element resistance of the NOx sensor on bank 1 sensor 2 is outside the calibrated range. Used as a sensor-element health check.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 4B
Possible causes
- Heater element aged high
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: 200–1200 €
- Estimated time: 1–3 h
- Component: nox sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012