Question about 2002 Ford Crown Victoria

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Exhaust Gas Recirculation Flow Insufficient Detected 2002 Ford Crown Victoria LX The car works very good at 60 and I go 35 to city and then when we slow down to city speeds it will have little jerks and we speed up to go home the Check Light comes on and we stop and put the Code Reader on and it will come up with one Code and that is EGRFID as I have on the top .. I then erase the code and go Home. I Put a New EGR a new Throttle Senser A New Restricter Valve (Next to the EGR) and all of these didn't Help. I think these Little Jerks are the trouble. Can you Please Help as This has been going on for Months.. I get very good Mileage 28 to 30 Thanks Willard J Baird Box 54 Broadview,Montana 59015 willyb@itsriangle.com

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P0401 - EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.

  • Vacuum supply
  • EGR valve stuck closed
  • EGR valve leaks vacuum
  • EGR flow path restricted
  • EGRVR circuit shorted to PWR
  • VREF open to D.P.F. EGR sensor
  • D.P.F. EGR sensor downstream hose off or plugged
  • EGRVR circuit open to PCM
  • VPWR open to EGRVR solenoid
  • D.P.F. EGR sensor hoses both off
  • D.P.F. EGR sensor hoses reversed
  • Damaged EGR orifice tube
  • Damaged EGRVR solenoid
  • Damaged PCM
Perform KOER self-test and look for DTC P1408 as an indication of a hard fault. If P1408 is not present, look for contamination, restrictions, leaks, and intermittents.
not likely the PCM, engine computer. they seldom go bad.
report back findings.

Posted on May 16, 2010

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