Powertrain
generic / SAE
P2BAF
NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1
The heater sense feedback of NOx sensor 1 on bank 1 reports values that do not match expected operation. The sensor warm-up cycle does not behave as the diagnostic expects.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberB / AF
Possible causes
- NOx sensor aging high
- High resistance in heater circuit medium
- Sensor element aged beyond calibration window 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: hard
- DIY: shop recommended
- Estimated cost: 400–1500 €
- Estimated time: 1–4 h
- Component: nox sensor
- Component: nox heater circuit
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012