P2201 – NOx Sensor Range/Performance

Description

The NOx sensor is reporting values outside the expected range. This affects emissions control and engine performance.

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Symptoms

  • Poor fuel economy
  • Reduced power
  • Check engine light

Causes

  • Faulty NOx sensor
  • Exhaust contamination
  • Wiring issues

Diagnosis

  • Check NOx sensor readings
  • Inspect exhaust system
  • Test wiring

Repair

  • Replace NOx sensor
  • Repair wiring