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P1406 – EGR Valve Pintle Position Fault

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Symptoms

  • Rough idle
  • Hesitation
  • Emissions failure

Causes

  • Carbon buildup
  • Faulty EGR valve
  • Sensor issue

Diagnosis

  • Check pintle movement
  • Inspect passages
  • Read sensor data

Repair

  • Clean EGR valve
  • Replace valve
  • Repair wiring
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