Powertrain
generic / SAE
P23AC
NOx Sensor Circuit Bank 1 Sensor 3
A general circuit fault on the third NOx sensor of bank 1.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / AC
Possible causes
- Open in sensor or wiring 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: 1–1.8 h
- Component: nox sensor b1s3
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012