P1408 – EGR Flow Out of Range (Ford)

Description

P1408 Ford indicates the EGR system flow is outside the expected range during PCM testing.

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Symptoms

  • Rough idle
  • Hesitation
  • Poor fuel economy

Causes

  • Clogged EGR passages
  • Faulty EGR valve
  • DPFE sensor issues

Diagnosis

  • Test EGR flow
  • Inspect passages
  • Check DPFE readings

Repair

  • Clean EGR passages
  • Replace EGR valve
  • Replace DPFE sensor