OBD-II code · Powertrain (generic, extended)
P229E NOx Sensor Circuit (Bank 1 Sensor 2)
NOx Sensor Circuit (Bank 1 Sensor 2): an electrical fault is present in the circuit.
Is it safe to drive with P229E?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySensor element failed
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
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Nox Sensor
Related codes
- P2213NOx Sensor Circuit (Bank 2)
- P229BFuel Pressure Regulator B Exceeded Control Limits - Pressure Too High
- P229CFuel Pressure Regulator B Exceeded Learning Limits - Too Low
- P229DFuel Pressure Regulator B Exceeded Learning Limits - Too High
- 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)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.