P1404 – EGR Valve Stuck Open (Nissan)

Description

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

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Symptoms

  • Stalling
  • Rough idle

Causes

  • Valve sticking
  • Carbon buildup
  • Vacuum issue

Diagnosis

  • Inspect valve
  • Check vacuum lines
  • Scan EGR data

Repair

  • Clean valve
  • Replace valve