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P1404 – EGR Valve Stuck Closed

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Symptoms

  • Hesitation
  • Rough idle
  • High NOx emissions

Causes

  • Carbon buildup
  • Faulty EGR valve
  • Vacuum issue

Diagnosis

  • Command EGR valve
  • Inspect passages
  • Check vacuum lines

Repair

  • Clean EGR passages
  • Replace EGR valve
  • Repair vacuum leaks
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