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P1401 – EGR Valve Circuit Low

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Symptoms

  • Rough idle
  • Hesitation
  • Emissions failure

Causes

  • Short to ground
  • Damaged wiring
  • Faulty EGR valve

Diagnosis

  • Measure valve voltage
  • Inspect wiring
  • Scan ECU

Repair

  • Repair wiring
  • Replace EGR valve
  • Clean connector
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