Powertrain
generic / SAE
P22A3
NOx Sensor Heater Control Circuit/Open (Bank 1 Sensor 2)
The drive circuit for the NOx sensor heater on bank 2 is open. The sensor cannot reach operating temperature.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / A3
Possible causes
- Heater winding open high
- Pin pushed back out of connector body low
- Cracked solder joint inside the module or sensor 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: shop recommended
- Estimated cost: 200–1200 €
- Estimated time: 1–3 h
- Component: nox sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012