OBD-II code · Powertrain (generic, extended)
P2212 NOx Sensor Heater Sense Circuit Intermittent (Bank 1 Sensor 1)
The feedback line that monitors the NOx sensor heater current draw on bank 1 sensor 1 jumps or drops out intermittently — connector or harness issue.
Is it safe to drive with P2212?
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
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Nox Sensor
Related codes
- P22AANOx Sensor Heater Sense Circuit Intermittent (Bank 1 Sensor 2)
- P220FNOx Sensor Heater Control Circuit Range/Performance (Bank 1 Sensor 2)
- P2210NOx Sensor Circuit Intermittent (Bank 2)
- P2211NOx Sensor Heater Sense Circuit Intermittent (Bank 2)
- P2213NOx Sensor Circuit (Bank 2)
- P2214NOx Sensor Circuit Range/Performance (Bank 2)
- P2215NOx Sensor Circuit Low (Bank 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.