Question about 2002 Ford Explorer Sport

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EGR valve mystery problem

I have a 2002 Ford Explorer (6 cylinder) that won't pass emissions. The only error code I get is EGR insufficient flow. I removed it and cleaned it. Seems to be working fine. I did the vacuum test on it and the engine almost died when I applied vacuum. I removed the throttle body cover and cleaned with carb cleaner inside and out and still get the same code. Maybe the EGR vacuum regulator valve? Help!

Randy

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You have carbon built up in there.its going to be hard to get it out it can be done.if u can take egr valve out spray some carb cleaner in there. and then try blowing it out with a air gun.watch your eyes as chuncks of carbon will fly out.do it a couple of times and then reassamble.

Posted on Mar 10, 2009

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I need to know what the problem the p0401 what is the problem 1999 grand Victoria Ford 4.9


wow I wish ford could make a egr system that wouldn't fail as I've seen this one go a lot lately ! anyways the code is for insufficient flow in the egr system , this is a means to recirculate some of your exhaust back into your intake , as a means to reburn some of your excess fuel (emissions) , anyways it consists of a means to meter some of the exhaust , and control it (off/on) also to measure the amount that goes in , its part of the closed loop of the fuel inlet system , the fault code is specifically saying flow sensor cant detect any flow in the pipe , there can be a few causes for this including a bad flow sensor , all are from my opinion a poorly designed system (it doesn't self clean it's self ) as almost a guaranty every 60k miles your gonna have some problem with it

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Nothing for that code either. Are you sure you are reading the reader properly?

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1 Answer

96 cutlass supreme will not pass emission in ut. what should I do? KOER failed, trouble code po401


cleanout egr valve and troutle body . Or replace egr with new one, clean, check vacumm lines , check for clogged check , depending on modle of car you can pippoint problem as some have a common part problem depeding with make of car. But all have to do with exaust system. Insufficient flow exaust flow. Im not an expert, all I know it is related to this, I have it myself so im googling it.

Ford EGR valve

The OBDII fault code P0401 means that the engine computer has detected that the Exhaust Gas Recirculation (EGR) system flow is insufficient. Read more how the EGR system works below. What could cause the code P0401 - clogged or restricted EGR passages
- faulty EGR valve
- EGR valve stuck closed
- problems with the DPFE sensor (Ford)
- problems with hoses to the DPFE sensor (Ford)
- problem with the EGR vacuum switching valve (Toyota)
- clogged catalytic converter
- carboned up EGR temperature sensor
- vacuum supply issues at the vacuum-operated EGR valve
- electrical problems with the EGR valve control circuit
- engine computer problems
helpful website helps you with pinpoint and sou;ution related to auto make and model shows you most common cause of code reading.
www.samarins.com

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1 Answer

P0401 EGR code In Ford explorer 2002


PO401--- EGR Flow Insufficient Detected

If all you have is an egr valve replace it

If you have other hoses & sensors coming & going from it,
leave it to a repair shop

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1 Answer

I have a ford explorer sport 2002 and my chek engine light came on it put out a code PO401 do you know what i need to buy


PO401 code means that:
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1 Answer

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Cylinder misfiring hapens when ignition coil is bad and bad spark plugs.
System to lean is usualy when fuel pump lose pressure or you have blown gasket on intake manifold. Check fuel pressure first.
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PO4O1 (egr fault) I believe this would be OBD-2 on a 2002 model eh?

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