OBD-II code · Powertrain (generic, extended)
P2225 NOx Sensor Heater Sense Circuit Intermittent (Bank 2)
The feedback line that monitors the NOx sensor heater current draw on bank 2 sensor 1 jumps or drops out intermittently — connector or harness issue.
Is it safe to drive with P2225?
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
- P2211NOx Sensor Heater Sense Circuit Intermittent (Bank 2)
- P2212NOx Sensor Heater Sense Circuit Intermittent (Bank 1 Sensor 1)
- P2222NOx Sensor Heater Sense Circuit Range/Performance (Bank 2)
- P2223NOx Sensor Heater Sense Circuit Low (Bank 2)
- P2224NOx Sensor Heater Sense Circuit High (Bank 2)
- P2226Barometric Pressure Circuit
- P2227Barometric Pressure Circuit Range/Performance
- P2228Barometric Pressure Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.