OBD-II code · Powertrain (generic, extended)
P22FB NOx Sensor Performance - Sensing Element (Bank 1 Sensor 1)
The wide-band sensing element of the NOx sensor on bank 1 sensor 1 reports an internal performance fault — typically poisoning, condensate damage, or end of service life.
Is it safe to drive with P22FB?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyElement poisoned or end of life
- Less likelySensor element aged beyond calibration window
- Less likelySensor element contaminated by oil, soot or coolant
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
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3 h
- Emissions test
- Likely to fail
- Parts involved
- Nox Sensor
Related codes
- P22F8Cylinder 8 Alternative Fuel Injector Control Circuit Range/Performance
- P22F9NOx Sensor Performance - Slow Response Low to High (Bank 1 Sensor 1)
- P22FANOx Sensor Performance - Slow Response High to Low (Bank 1 Sensor 1)
- P22FCNOx Sensor Performance - Slow Response Low to High (Bank 1 Sensor 2)
- P22FDNOx Sensor Performance Slow Response High to Low Bank 1 Sensor 2
- P22FENOx Sensor Sensing Element Bank 1 Sensor 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.