P2200 – NOx Sensor Circuit Malfunction
Description
The NOx sensor is reporting invalid or missing data. This disrupts emissions control and may trigger limp mode.
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Compare Diagnostic ScannersSymptoms
- Poor fuel economy
- Reduced power
- Check engine light
- Emissions failure
Causes
- Faulty NOx sensor
- Wiring damage
- ECM fault
- Contaminated sensor
Diagnosis
- Check NOx sensor data
- Inspect wiring
- Test ECM inputs
Repair
- Replace NOx sensor
- Repair wiring