In this video I will be addressing a P1409 fault code (EVR control circuit fault). Within the process of diagnosing this EVR solenoid fault, I will show you how to test the entire EGR system.

Engine Performance Diagnostics chapters 24

symptoms 50

  • check engine light (P1409)

fix 50

  • replace EVR solenoid

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 test the EGR valve regulator solenoid (EVR)
  • how to test the delta pressure feedback sensor (DPFE)
  • how to test the computer's control of the EVR solenoid
  • how to verify wiring integrity

Tools used

  • scan tool
  • labscope
  • incandescent test light
  • backprobing pins
  • vacuum gauge
  • digital multimeter

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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 :


Ford Ranger EGR Flow Trouble Code P0401 (DPFE fault):


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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