Powertrain
generic / SAE
P22A1
NOx Sensor Circuit High (Bank 1 Sensor 2)
NOx Sensor Circuit High (Bank 1 Sensor 2): the signal voltage is above the expected range. Often an open circuit or a short to supply voltage.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / A1
Possible causes
- Open signal line high
- Connector pins corroded - high contact resistance low
- Supply wire pinched against B+ source 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: shop recommended
- Estimated cost: 200–1200 €
- Estimated time: 1–3 h
- Component: nox sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012