P2200: NOx sensor circuit fault (bank 1)
The ECU sees an electrical fault in the exhaust nitrogen oxides sensor. Usually the connector, the wiring or the sensor itself.
| Code | P2200 |
|---|---|
| System | Engine and transmission |
| Group | P22xx, NOx sensors, oxygen sensors and emissions |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P2200 means
The NOx sensor measures nitrogen oxides in the exhaust to control emission systems such as AdBlue (SCR) or certain catalysts. It has its own small control module attached. This code means the sensor circuit is not working as it should, almost always because of an electrical problem.
Most common causes
- Loose, dirty or corroded sensor connector
- Wiring damaged by heat or chafing under the car
- Faulty fuse or power supply to the sensor
- Failed NOx sensor (the sensor and its module usually come as one unit)
- Communication fault between the sensor module and the ECU
Symptoms
- Engine warning light on
- Sometimes an AdBlue or emissions warning
- Possible power limitation on some cars
- Engine usually runs as normal
Can you drive with P2200?
With care You can drive, but on some AdBlue diesels the fault can lead to reduced power or a warning that the engine will not restart after a set distance. Get it to a workshop soon.
Open the bonnetthe in-depth explanation
How to check it
Check whether there are communication codes (starting with U) stored at the same time: if so, the problem is often the power supply or wiring to the sensor module rather than the sensor. If the car shows a distance countdown, write it down.
How to read and clear P2200 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2200 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2201 NOx sensor circuit range or performance problem (bank 1)
- P2202 The NOx sensor (bank 1) gives a lower signal than normal
- P2203 The NOx sensor (bank 1) gives a higher signal than normal
- P2204 The NOx sensor (bank 1) fails now and then
- P2227 Barometric pressure sensor A range or performance problem
- P2228 Barometric pressure sensor A circuit low
- P2229 Barometric pressure sensor A circuit high
- P2237 Oxygen sensor current control circuit open (bank 1, sensor 1)
To understand it properly
We explain how that system works, with drawings and no waffle, in our mechanics guide: AdBlue.
What does code P2200 mean?
The NOx sensor measures nitrogen oxides in the exhaust to control emission systems such as AdBlue (SCR) or certain catalysts. It has its own small control module attached. This code means the sensor circuit is not working as it should, almost always because of an electrical problem.
Can you drive with P2200?
You can drive, but on some AdBlue diesels the fault can lead to reduced power or a warning that the engine will not restart after a set distance. Get it to a workshop soon.
How do you clear P2200?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2200 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
