Powertrain
generic / SAE
P2204
NOx Sensor Circuit Intermittent (Bank 1)
The bank 1 NOx sensor signal drops out intermittently. Typical cause is a marginal connector, harness chafing near hot exhaust components, or thermal-cycling solder joints inside the smart sensor.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 04
Possible causes
- Connector intermittent contact high
- Harness chafed near exhaust medium
- Connector with intermittent contact under vibration 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: 80–800 €
- 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