OBD-II code · Powertrain (generic, extended)
P2222 NOx Sensor Heater Sense Circuit Range/Performance (Bank 2)
NOx Sensor Heater Sense Circuit Range/Performance (Bank 2): the signal is implausible or outside the valid range. The NOx sensor heater brings the sensor to operating temperature; a fault delays accurate NOx readings used for SCR control.
Is it safe to drive with P2222?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySense circuit drift
- Less likelySensor element aged beyond calibration window
- Less likelySensor mounting loose - signal damping
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)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Nox Sensor
Related codes
- P2209NOx Sensor Heater Sense Circuit Range/Performance (Bank 2)
- P2221NOx Sensor Heater Sense Circuit (Bank 2)
- P221FReductant Heater C Current Too High
- P2220NOx Sensor Heater Control Circuit High (Bank 2)
- P2223NOx Sensor Heater Sense Circuit Low (Bank 2)
- P2224NOx Sensor Heater Sense Circuit High (Bank 2)
- P2225NOx Sensor Heater Sense Circuit Intermittent (Bank 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.