Powertrain
generic / SAE
P2202
NOx Sensor Circuit Low (Bank 1)
The NOx sensor signal on bank 1 is below the lower limit. Either short to ground on the analog return, sensor failed at low end, or pump cell stuck.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 02
Possible causes
- Signal wire shorted to ground high
- Sensor failed low 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