OBD-II code · Powertrain (generic, extended)
P22A2 NOx Sensor Circuit Intermittent (Bank 1 Sensor 2)
NOx Sensor Circuit Intermittent (Bank 1 Sensor 2): the signal is intermittent or erratic. Often a loose connector or chafed wiring; a wiggle test often locates it.
Is it safe to drive with P22A2?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIntermittent connector
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
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
- 0.7–3 h
- Emissions test
- Likely to fail
- Parts involved
- Nox Sensor
Related codes
- P2217NOx Sensor Circuit Intermittent (Bank 2)
- P229FNOx Sensor Circuit Range/Performance Bank 1 Sensor 2
- P22A0NOx Sensor Circuit Low (Bank 1 Sensor 2)
- P22A1NOx Sensor Circuit High (Bank 1 Sensor 2)
- P22A3NOx Sensor Heater Control Circuit/Open (Bank 1 Sensor 2)
- P22A4NOx Sensor Heater Control Circuit Low (Bank 1 Sensor 2)
- P22A5NOx Sensor Heater Control Circuit High (Bank 1 Sensor 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.