P1405 – EGR Valve Stuck Closed (Nissan)

Description

The ECM detected an EGR valve stuck in the closed position.

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Symptoms

  • High NOx emissions
  • Hesitation

Causes

  • Valve sticking
  • Carbon buildup
  • Vacuum issue

Diagnosis

  • Inspect valve
  • Check vacuum lines
  • Scan EGR data

Repair

  • Clean valve
  • Replace valve