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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Symptoms

  • 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