Powertrain
generic / SAE
P23C2
NOx Sensor Delayed Response High to Low Bank 1 Sensor 3
Same as P23C0 with a measurable delay before the sensor begins to track falling levels - the start of the response is delayed, not just the slope.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / C2
Possible causes
- Sensor 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: 1–1.8 h
- Component: nox sensor b1s3
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012