P0402 – EGR Flow Excessive

Description

The EGR system is flowing too much exhaust gas.

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Symptoms

  • Rough idle
  • Hesitation
  • Poor acceleration
  • Stalling
  • Check engine light

Causes

  • Stuck EGR valve
  • Faulty DPFE sensor
  • Vacuum leak
  • Carbon buildup
  • ECU issue

Diagnosis

  • Inspect EGR valve
  • Test DPFE sensor
  • Check vacuum lines
  • Inspect passages
  • Scan live data

Repair

  • Replace EGR valve
  • Replace DPFE sensor
  • Fix vacuum leaks
  • Clean passages
  • Update ECU