Question about 1998 Ford Windstar

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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?

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You might be suprised to know that its probably a bad plug or coil pack. it might even be the electronic control module...ECM

Posted on Sep 25, 2009

Testimonial: "thanx for the info. i'll check that out also. thanx again. "

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

Posted on Sep 25, 2009

Testimonial: "thanx for that comment, the windstar had a tune-up a year ago and it has 148,000 miles on it, and it has lots of power, cat is not clogged"

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1 Answer

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

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

I have the code PO401 AND PO402 codes on my 2002 focus, any suggestions?


PO401: EGR insufficient flow detected
PO402: EGR excessive flow detected

A code P0402 most likely means one or more of the following has happened:

The DPFE (differential pressure) sensor is faulty and needs to be replaced
There is a blockage in the EGR (most likely carbon buildup)
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum

Feb 25, 2012 | 2002 Ford Focus

1 Answer

Engine light on code reads po401


I believe this code is insufficient EGR flow. On this engine, the passages to the EGR valve often become carboned up and cause this code. Remove the EGR valve and inspect the passages to see if they need to be cleaned.

Jun 14, 2010 | 2006 Ford Mustang

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

2 Answers

97 toy corolla DTC po300 po301 po401 po402


po300 random/multiple cylinder misfire detected po301 cylinder 1misfire detected po401egr flow insufficient po 402egr flow excessive

Feb 11, 2010 | 1997 Toyota Corolla

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

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

Fault code 402 have changed egr valve exh pressure sensor & egr solenoid nothing helps


po402--egr flow excessive, maybe carbon has built up in egr opening in engine!! or curcuit to egr valve is bad.

Aug 27, 2009 | 2002 Ford F150 Regular Cab

2 Answers

2002 ford windstar 3.8 liter code PO402


I know this is a old post, but I had the same problem and it was the dpfe sensor. The EGR is almost never the problem with this code

Jul 15, 2008 | 2002 Ford Windstar Cargo

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