Powertrain
generic / SAE
P2208
NOx Sensor Heater Circuit (Bank 2)
A general electrical fault on the heater of the bank 2 NOx sensor. NOx sensors must reach roughly 800 C to measure correctly; without heater current the sensor never enters its operating range.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 08
Possible causes
- Heater element failed high
- Heater wiring open or connector loose 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: 300–1000 €
- Estimated time: 0.5–2 h
- Component: nox sensor b2
- Component: nox sensor heater
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012