Question about 1995 Ford Windstar

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Windstar po1537 po1538 po401 - 1995 Ford Windstar

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Posted on Jan 02, 2017

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SOURCE: I have a 99 Windstar 3.8L Keep getting DTC PO401

Does the egr vavle open ? You will need to use a scanner to test the dpfe voltage when the egr valve is energized you should read around 3.5 4.00 volts. Also you could remove the vacume line from the egr valve and with the engine running you should see around 100 rpm drop in engine rpm at least this would indicate the egr valve is capable of flowing egr gases through the system to the cylinders.

Posted on May 30, 2010

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I have a ford windstar 2001 LX 3.8 i have the codes po401 po171 and po174


171 is a HEGO sensor unable to switch/ 174 is for HEGO sensor also.. 401 is insufficient EGR flow!! egr valve may be clogged or need replaced!!

Feb 26, 2015 | 2001 Ford Windstar

1 Answer

How to fix code PO401 2001 winstar sel ?


call the dealer i believe theres a recall.

Aug 24, 2014 | 2001 Ford Windstar

1 Answer

Fuel trim short term 1 or 3 plus p0401 insufficient exhaust flow


The PO401 you can Google
It is an EGR Issue
The fuel trim could be vacuum leaks,oxygen sensor
issue,cylinder ignition misfires.
Once you resolve the Egr System problem, you continue on
with your testing. Insufficient flow means you have less exhaust
gas re-entering the intake, than you should have,so I would say
you have two or more issues

Jul 12, 2013 | 2001 Ford Windstar

1 Answer

2001 windstar have code po401


PO401 is a egr problem, low /no flow detected. Unfortunatly most of the time with the 3.8 engine is the ports in the intake manifold get clogged. So if testing reveles the egr valve is working and the dpfe sensor is reading between around .8 to 1.2 volts at idle your probably looking at taking all the plastic plenum parts off to clean the passages. This can be done without removing the wiper box abobe the plenum but you have to remove the iac and sneek the manifold our from the drivers side forward first.

Jul 11, 2012 | 2001 Ford Windstar

1 Answer

P0401 egr flow insufficient


po401 it has been my experience that the dpfe sensor is bad check that first

Aug 17, 2010 | 1998 Ford Windstar

1 Answer

I have a 99 Windstar 3.8L Keep getting DTC PO401 have replaced DPFE EGR Valve and EGR tube still keep getting Code PO401


Does the egr vavle open ? You will need to use a scanner to test the dpfe voltage when the egr valve is energized you should read around 3.5 4.00 volts. Also you could remove the vacume line from the egr valve and with the engine running you should see around 100 rpm drop in engine rpm at least this would indicate the egr valve is capable of flowing egr gases through the system to the cylinders.

May 30, 2010 | 1999 Ford Windstar

1 Answer

I have a 98 ford windstar 3.8 with a engine miss and two trouble codes, po401 and 402, would a bad EGR valve cause this problem?


I replaced the coil pack on my friends wind star when they had a mis. If you take the sparkplug wires loose and just set them on the plugs loose it will be easy to remove them with the engine running. Useing plastic plyers or some kind of insulated grabers, one by one take the wire away from the plug/or coil and see if it makes a difference.Take it away then put it back then go to the next one.If it runs the same when the wire is off then you probably will not hear a spark at that wire. The coils do go bad on alot of newer cars.
I hope this info helps you.

Sep 25, 2009 | 1998 Ford Windstar

2 Answers

I have a 98 ford windstar with a 3.8, that has an engine miss and two dtc's po401 and po402, would a bad EGR valve cause this miss?


HI you maybe having this codes and engine missing because of a plug up catalytic converter have it tested at your muffler shop

Sep 25, 2009 | 1998 Ford Windstar

1 Answer

1998 Ford Windstar, no start with out pushing on throttle, some times not then, runs ok after it starts. have codes, PO340 & PO401


po401 is egr flow insufficiant ( the egr needs removed and cleaned also clean where it mounts to engine. po340 is camshaft position sensor A- bank 1 curcuit malfunction. it is a bad camshaft sensor.

Sep 20, 2009 | 1998 Ford Windstar

1 Answer

Engine codes Po171 Po174 Po401


The vast majotity of Ford vehicles with P0171 and P0174 codes are suffering with a vacuum leak. The biggest culprits are the hoses going to the PCV valve. The rubber deteriorates due to heat and oil fumes. Check the hoses and rubber elbows between the PCV valve and the intake manifold. Pay very close attention to the rubber elbows. They crack on the onside and can be hard to spot.

May 20, 2008 | 2001 Ford Windstar

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