Yes, another Ford EGR problem! This one shows some of the same procedures as my other Ford EGR videos (listed below) but there is a little more attention given to the DPFE sensor in this one.

Engine Performance Diagnostics chapters 24

symptoms 50

  • check engine light (P0401) EGR Insufficient Flow Detected

fix 50

  • replace faulty DPFE sensor

test shown enh 50

  • how to test for proper EGR flow
  • how to test the EGR valve itself
  • how to verify vacuum supply from the EVR solenoid to the EGR valve
  • how to manually open an EGR valve regulator solenoid (EVR)
  • how to test the delta pressure feedback sensor (DPFE)
  • how to verify wiring integrity

Tools used

  • scan tool
  • labscope
  • incandescent test light
  • backprobing pins
  • digital multimeter (may be used in place of lab scope)

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(Chapter 24) EGR Flow and System Tests

Related videos:

How to test an EGR DPFE sensor (EGR flow test) - Ford, Lincoln, Mercury :


2000 Ford Focus EGR System Tests (EGR, DPFE, EVR) - P1409:


How to test for proper EGR flow (restricted intake passage) - Ford :


Ford EGR Flow Testing (P0401, P0402, P0405):


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

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