Powertrain
generic / SAE
P2200
NOx Sensor Circuit (Bank 1)
The NOx sensor on bank 1 — typically upstream of the SCR catalyst — does not communicate or sends an invalid signal. NOx sensors are smart sensors with their own controller on the CAN bus; faults often involve heater failure or bus dropout.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 00
Possible causes
- NOx sensor failed high
- Sensor wiring or CAN harness open medium
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
- Component: nox sensor wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012