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P1405 – EGR Valve Stuck Open

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Symptoms

  • Stalling
  • Rough idle
  • Hard starting

Causes

  • Carbon buildup
  • Faulty EGR valve
  • ECU issue

Diagnosis

  • Command EGR valve
  • Inspect passages
  • Scan ECU

Repair

  • Replace EGR valve
  • Clean passages
  • Update ECU
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