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P1408 – EGR System Excessive Flow

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Symptoms

  • Stalling
  • Rough idle
  • Hard starting

Causes

  • Stuck open valve
  • Vacuum leak
  • ECU issue

Diagnosis

  • Command EGR valve
  • Inspect vacuum lines
  • Scan ECU

Repair

  • Replace EGR valve
  • Repair vacuum leaks
  • Update ECU
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