OBD-II code · Powertrain (generic, extended)
P2200 NOx Sensor Circuit (Bank 1)
The NOx sensor on bank 1 — typically upstream of the SCR catalyst — does not communicate or sends an invalid signal. NOx sensors are smart sensors with their own controller on the CAN bus; faults often involve heater failure or bus dropout.
Is it safe to drive with P2200?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyNOx sensor failed
- PossibleSensor wiring or CAN harness open
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
- 0.5–2.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Nox Sensor, Nox Sensor Wiring
Related codes
- P2206NOx Sensor Circuit (Bank 2)
- P2213NOx Sensor Circuit (Bank 2)
- P21FDFuel Control System B Too Rich at Higher Load (Bank 1)
- P21FEFuel Control System B Too Lean at Higher Load (Bank 2)
- P21FFFuel Control System B Too Rich at Higher Load (Bank 2)
- P2201NOx Sensor Range/Performance (Bank 1)
- P2202NOx Sensor Circuit Low (Bank 1)
- P2203NOx Sensor Circuit High (Bank 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.