Powertrain
generic / SAE
P2203
NOx Sensor Circuit High (Bank 1)
The NOx sensor signal on bank 1 is above the upper limit — short to supply, open ground, or a sensor that failed high. SCR control runs in default mode.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 03
Possible causes
- Signal wire shorted to supply high
- Sensor failed high medium
- Connector pins corroded - high contact resistance 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
- Component: nox sensor wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012