Powertrain
generic / SAE
P23BB
NOx Sensor Heater Resistance Bank 1 Sensor 3
The resistance of the NOx sensor heater on bank 1 sensor 3 is outside the calibrated band - aged element or contact resistance increased.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / BB
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: 400–850 €
- Estimated time: 1–2 h
- Component: nox sensor b1s3 heater
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012