Powertrain
generic / SAE
P2205
NOx Sensor Heater Control Circuit (Bank 1)
The heater inside the bank 1 NOx sensor cannot be controlled — open, short, or failed driver. Without proper heater operation the sensor never reaches its operating temperature and reports invalid data.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 05
Possible causes
- Heater element open high
- Heater short to supply or ground 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 heater
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012