P1402 — Ford — EGR Metering Orifice Restricted

P1402 (Ford): EGR Metering Orifice Restricted — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

EGR Metering Orifice Restricted. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

  • Illuminated Check Engine light
  • Rough engine idle
  • Decreased engine performance
  • Noticeable reduction in fuel economy
  • Failed emissions test

Possible causes

  • Carbon buildup clogging the EGR orifice
  • Defective EGR valve assembly
  • Damaged or loose vacuum lines to the EGR
  • Faulty Differential Pressure Feedback (DPFE) sensor
  • Clogged EGR supply tubes

What to check

  • Inspect all vacuum lines connected to the EGR system for cracks or leaks
  • Remove the EGR valve and check the metering orifice for heavy carbon deposits
  • Clean the EGR passages and the orifice using a specialized carbon cleaner
  • Test the DPFE sensor voltage signal using a multimeter or scan tool
  • Replace the EGR valve assembly if the internal diaphragm or mechanical components are seized