Powertrain
generic / SAE
P2211
NOx Sensor Heater Sense Circuit Intermittent (Bank 2)
The heater sense line on the bank 2 NOx sensor produces intermittent readings. Often a thermal fault inside the sensor or a connector under temperature cycling.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 11
Possible causes
- Connector intermittent under temperature high
- Sensor heater intermittent when hot medium
- Harness routed against vibrating component 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: 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