OBD-II code · Powertrain (generic, extended)
P2209 NOx Sensor Heater Sense Circuit Range/Performance (Bank 2)
The heater feedback (sense) line on the bank 2 NOx sensor reports values outside the expected window — heating is happening but the temperature does not match the model.
Is it safe to drive with P2209?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyHeater element ageing, resistance drift
- PossibleSensor module failed
- Less likelySensor element aged beyond calibration window
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
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Nox Sensor B2, Nox Sensor Heater
Related codes
- P2208NOx Sensor Heater Circuit (Bank 2)
- P2222NOx Sensor Heater Sense Circuit Range/Performance (Bank 2)
- P2206NOx Sensor Circuit (Bank 2)
- P2207NOx Sensor Circuit Range/Performance (Bank 2)
- P220ANOx Sensor Supply Voltage Circuit (Bank 1 Sensor 1)
- P220BNOx Sensor Supply Voltage Circuit (Bank 1 Sensor 2)
- P220CNOx Sensor Supply Voltage Circuit (Bank 2 Sensor 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.