OBD-II code · Powertrain (generic, extended)
P2208 NOx Sensor Heater Circuit (Bank 2)
A general electrical fault on the heater of the bank 2 NOx sensor. NOx sensors must reach roughly 800 C to measure correctly; without heater current the sensor never enters its operating range.
Is it safe to drive with P2208?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyHeater element failed
- PossibleHeater wiring open or connector loose
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
- P2206NOx Sensor Circuit (Bank 2)
- P2211NOx Sensor Heater Sense Circuit Intermittent (Bank 2)
- P2205NOx Sensor Heater Control Circuit (Bank 1)
- P2207NOx Sensor Circuit Range/Performance (Bank 2)
- P2209NOx Sensor Heater Sense Circuit Range/Performance (Bank 2)
- P220ANOx Sensor Supply Voltage Circuit (Bank 1 Sensor 1)
- P220BNOx Sensor Supply Voltage Circuit (Bank 1 Sensor 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.