Powertrain
generic / SAE
P2201
NOx Sensor Range/Performance (Bank 1)
The bank 1 NOx sensor reports values outside the plausibility window against modeled NOx and the downstream sensor. Often slow response from contamination by oil ash or coolant.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 01
Possible causes
- NOx sensor aged — slow response high
- Sensor element contaminated medium
- Sensor element aged beyond calibration window low
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: possible
- Estimated cost: 200–1000 €
- Estimated time: 0.5–2.5 h
- Component: nox sensor
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012