Check Engine throwing code P0401 - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 04-13-2011
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Check Engine throwing code P0401

So I recently had my 02 Ranger in to AAMCO to get the trans fluid flushed, filled and a new filter and gasket, it's got just over 100k on it and it was last done around 67k.

Anyway I also asked them to hook it up to a computer and let me know why my Check Engine light was on and if it were a sub $150 repair to just go ahead and do it. I got a note back that it was the following:

P0401 = EGR insufficient flow detected

and that they would need a day to determine the causes and it would incur diagnostic feels at $100\hr. and so on. So I told them thanks for letting me know what it is and I'll see if I can fix it myself, if not "i'll let you know" (yea right).

I see that this code is plastered all over this forum, but I wanted advice as to where i shuold start. I already replaced the little elbow right to the left of the trottle that was worn out with a crack in it.
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Old 07-13-2011
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UPDATE: so the P0401 code still exists, I got an Android phone and am using a bluetooth OBDII chip with the Torque app so I can scan for the codes it's throwing and it's only this one. I had a local shop replace my EGR valve as thats where many of the posts on this form pointed, I pulled the battery to clear the computer, but after about 70 miles the light came back on with the same code.


What should I look at next?
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Old 07-14-2011
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DPFE they are known to fail on fords.
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Old 07-14-2011
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how perfect of a timing... I just checked/broke my existing one so I ended up going out to AZ to get a new one for $30, I cleared the check engine light and we'll see if it stays off this next 100 miles or so.

Thanks!
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Old 07-22-2011
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DPFE is what I think it was... the light has been off for a week now, so we'll see how it goes. Thank you all for the advice.. also I thought I'd mention I used the Torque app for Android to diagnose ane clear the code, pretty cool for the free version.
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Old 07-22-2011
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Thanks for the update.
Many people forget to do that so we never find out if a fix worked or not.
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Old 01-24-2013
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I had the p0401 code. I cleaned the egr and MAF but its still throwing the code. The hose attached to it doesnt seem to have much suction. could that be causing the problem? Also I know its a stupid question but what is the DPFE? Any suggestions are appreciated.
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