Question about 2005 Ford F 250 Super Duty

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2005 Ford F250 Deisel DTC 401 Exhust recirulaton flow insuffent

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The DPFE sensor has failed on you egr system .Replace just this part and don't let someone sell you a egr valve .The sensor is about$70 and faily easy to do .:)

Posted on Sep 09, 2009

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Its a 6.0 liter diesel it doesn't not have a dpfe

P0401 is Exhaust Gas Recirculation Flow Insufficient Detected

i'm positive that your egr valve is all carboned up and needs to be replaced its very common
unless your really patient and its not a granteed to work
remove the egr and clean it with some tune up cleaner to loosen and remove the cabon buildup so the valve can move freely

Posted on Jan 31, 2010

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I have a mitsubish montero and keep getting code 401 after putting in a new egr valve I have also replaced O2 sensors and cannot figure out why the code keeps coming up


make sure egr passage way from valve to intake not clogged and make sure exhaust to egr supply is present and make sure if valve is vacuum operated that senser is ok and vacuum supply correct if electial egr senser then intake probably clogged sense code 401 is insuffence egr flow

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2006 ford f150 dtc codes 401, 402, 607


It is very possiable that you may be getting a false code that will reocure till egr problems are repaired. The ecu may be trying to compensate for egr problems causing it to send the 607 code

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Code P0401


Probably your EGR valve but check out this link with steps and procedures:

http://www.geocities.com/dtmcbride/home_garden/auto/dtc/p0401.html

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1 Answer

The EGR valve isn't getting the vaccum required to operate the valve. Check engine light is on. replaced the valve in check engine light still come on insuff. air flow


what dtc do you have? is it p1401? if so the description is for insufficent air flow egr circuit. this is typicaly caused by a faulty DPFE sensor (delta pressure feedback emission) it is about the size of a buisness card and about 1/2" thick. its black and has a small wiring connector and 2 thick vaccum hoses hoing to it. Fords first step for repair for this DTC is to replace dpfe sensor and to assure hoses are not ruptured. i STRONGLY SUGGEST to use only factory sensors as it is often i replace new aftermarket ones that done work right from the start. this part is relatively inexpensive....good luck!

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