Powertrain
generic / SAE
P229E
NOx Sensor Circuit (Bank 1 Sensor 2)
A general electrical fault on the NOx sensor on bank 2 — open, shorted, or out of plausibility. Used by SCR control and OBD NOx monitoring.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 9E
Possible causes
- Sensor element failed 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: hard
- DIY: shop recommended
- Estimated cost: 300–1500 €
- Estimated time: 1–4 h
- Component: nox sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012