P2200 to P2225: NOx sensors and their heaters
A NOx sensor, on bank 1 or bank 2, has a circuit fault, an implausible, low, high or intermittent signal, or a fault in its heater or heater sensing circuit.
SeverityModerateUsually not urgent today, but it can get worse if left.
Can you keep driving?Drive gently, check it soonWhat does P2200 mean?
NOx sensors measure the nitrogen oxides in the exhaust. Most diesels with AdBlue have one before the SCR catalyst and one after it, so the computer can dose the right amount and check that the catalyst is working; some petrol engines with a NOx trap use them too. Each sensor carries its own small control unit and heater. If one fails, the computer cannot prove the exhaust is clean, so the emission warning comes on and, on many cars, a countdown to a restart block begins.
What causes P2200?
- A failed NOx sensor, which wears out with heat and time
- A damaged wire or a corroded connector between the sensor and its control unit
- A failed heater inside the sensor
- Exhaust leaks ahead of the sensor letting outside air in
- Soot or oil contamination from an engine problem upstream
What to check first for P2200
- Note whether the car shows a countdown to a restart block or an emission warning
- Inspect the sensor's wiring along the exhaust and its control unit's connector
- Check the exhaust for leaks ahead of the sensor
- Have the NOx readings compared before and after the catalyst on a scan tool
Can you drive with P2200?
Usually you can drive to a workshop. If the car shows a countdown in kilometres to a restart block, have it repaired before it runs out, because the engine may then refuse to start.
Clear a code only after the fault is fixed. A code that comes back means the cause is still there, and a warning light left on can hide a second fault behind the first.
Codes on this page
26
- P2200NOx Sensor CircuitBank 1
- P2201NOx Sensor Circuit Range/PerformanceBank 1
- P2202NOx Sensor Circuit Low InputBank 1
- P2203NOx Sensor Circuit High InputBank 1
- P2204NOx Sensor Circuit Intermittent InputBank 1
- P2205NOx Sensor Heater Control Circuit/OpenBank 1
- P2206NOx Sensor Heater Control Circuit LowBank 1
- P2207NOx Sensor Heater Control Circuit HighBank 1
- P2208NOx Sensor Heater Sense CircuitBank 1
- P2209NOx Sensor Heater Sense Circuit Range/PerformanceBank 1
- P2210NOx Sensor Heater Sense Circuit Low InputBank 1
- P2211NOx Sensor Heater Sense Circuit High InputBank 1
- P2212NOx Sensor Heater Sense Circuit IntermittentBank 1
- P2213NOx Sensor CircuitBank 2
- P2214NOx Sensor Circuit Range/PerformanceBank 2
- P2215NOx Sensor Circuit Low InputBank 2
- P2216NOx Sensor Circuit High InputBank 2
- P2217NOx Sensor Circuit Intermittent InputBank 2
- P2218NOx Sensor Heater Control Circuit/OpenBank 2
- P2219NOx Sensor Heater Control Circuit LowBank 2
- P2220NOx Sensor Heater Control Circuit HighBank 2
- P2221NOx Sensor Heater Sense CircuitBank 2
- P2222NOx Sensor Heater Sense Circuit Range/PerformanceBank 2
- P2223NOx Sensor Heater Sense Circuit LowBank 2
- P2224NOx Sensor Heater Sense Circuit HighBank 2
- P2225NOx Sensor Heater Sense Circuit IntermittentBank 2
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
