Go Back   Ford Expedition Forum > Ford Expedition Forum > 1st Gen - 1997 - 2002

Sponsored Ads
Register to remove these ads.


1st Gen - 1997 - 2002

Code P0401 Problems.


This is a discussion on Code P0401 Problems. within the 1st Gen - 1997 - 2002 forums, part of the Ford Expedition Forum category!
Just bought a 1999 Expedition XLT 4.6L & noticed the trouble code P0401.. It Runs Pretty Rough Driving (lots of ...



Reply
 
LinkBack Thread Tools Display Modes
Old 07-10-2012, 01:55 PM   #1 (permalink)
 
Extortion's Avatar
Registered User

 
Join Date: Oct 2010
Location: Tampa
Posts: 38
Question Code P0401 Problems.

Just bought a 1999 Expedition XLT 4.6L & noticed the trouble code P0401.. It Runs Pretty Rough Driving (lots of vibrations) & also has a kind of ticking around the engine.. Would this code do any of those symptoms? What's the best way to get started on fixing this code as well? Thanks in advance!
Extortion is offline   Reply With Quote
Old 07-10-2012, 02:50 PM   #2 (permalink)
 
rburch's Avatar
Full Access Members

 
Join Date: Jun 2010
Location: Independence, Mo
Posts: 1,434
Default

OBD-II Trouble Code: P0401 Insufficient EGR Flow

You should start off by taking off the throttle body elbow and cleaning it making sure to pay attention to the egr passages. This is a known problem with carbon clogging up those passages.

Work from the bottom up on the causes list in the link!
__________________
rburch is offline   Reply With Quote
Old 07-10-2012, 02:52 PM   #3 (permalink)
 
Extortion's Avatar
Registered User

 
Join Date: Oct 2010
Location: Tampa
Posts: 38
Default

Any good tips on taking the Throttle body off and cleaning it? I never done this before & researching it hasn't given me much

Last edited by Extortion; 07-10-2012 at 02:53 PM.
Extortion is offline   Reply With Quote
Old 07-10-2012, 03:21 PM   #4 (permalink)
 
rburch's Avatar
Full Access Members

 
Join Date: Jun 2010
Location: Independence, Mo
Posts: 1,434
Default

Its fairly simple. there 3 bolts that hold the TB cover on and i believe 4 bolts on the intake elbow. Its easy to drop the bolts down under the intake manifold so be careful!

Use some carb cleaner to loosen the carbon and a screwdriver may be needed to loosen the carbon in the egr passages. inspect the EGR valve for carbon build up, if any claen it with the carb cleaner. Once you get it cleaned up put it back together and diconnect the neg battery cable for a couple of min to erase the codes and reset the computer. Start the truck and let it run at idle for 15 min to relaern air/fuel and idle speed etc. Let it get up to operating temp and take it for a test drive in city and hwy driving for 20-30 min. Drive it kind of aggressively to see if you get CEL. If the CEL doesnt come back your problem should be fixed!

Check back when finished!
__________________
rburch is offline   Reply With Quote
Old 07-10-2012, 04:44 PM   #5 (permalink)
 
Extortion's Avatar
Registered User

 
Join Date: Oct 2010
Location: Tampa
Posts: 38
Default

Thanks!!! I will give it a go tomorrow.. been raining all day here in FL
Extortion is offline   Reply With Quote
Old 07-11-2012, 09:38 PM   #6 (permalink)
 
Extortion's Avatar
Registered User

 
Join Date: Oct 2010
Location: Tampa
Posts: 38
Default

Just a quick question but how does this code make your truck run? I'm trying to figure put if my problems are due to this code.. obd2 only shows this code by the way. my truck runs like shit to say the least and i wanna make sure it's not the transmission going out on it. by any chance wouldnt a code be thrown for any trans issues?
Extortion is offline   Reply With Quote
Old 07-13-2012, 11:24 PM   #7 (permalink)
Registered User

 
Join Date: Jul 2012
Location: Springfield, Mo.
Posts: 3
Default

You need to replace the DPFE module. Do a search on this forum to get more details. I just went through the same thing with my 2000 Expy and the $53 part fixed me up. Clean your TB also, it can't hurt.
cyoung is offline   Reply With Quote
Old 08-11-2012, 05:01 PM   #8 (permalink)
Registered User

 
Join Date: Jul 2012
Location: Springfield, Mo.
Posts: 3
Default

I keep getting the P0401 code on and off every few weeks even after changing out the DPFE module. I cleaned the throttle body today and the CEL went off as soon as I put everything back together and started the truck. It only took about 30 minutes to remove and clean it and it was covered in black soot. I did not have to reset the battery to get the CEL to go off.
cyoung is offline   Reply With Quote
Old 08-11-2012, 05:16 PM   #9 (permalink)
 
Exia's Avatar
Full Access Members

 
Join Date: Jun 2012
Location: Kentucky
Age: 33
Posts: 234
Default

Try this site it even gives a video

OBD II Code P0401 (Ford)

I had the same issue when I first bought mine after changing out the DPFE, hoses, EGR Valve, & O2 sensor. Come to find out it was a Coil going bad. Once I replaced plugs and coils no more vibrations
__________________


2000 Expy 5.4 Traded ------ 2000 Steeda GT ----- 91 Nissan 300zx 2+2

Performance 300zx
NA2TT - 15k Worth!

Performance Steeda
BBK Headers, Steeda CatBack, Paxton Novi SC, TSX/iTSX wireless programmer.... simple listing... Stage 2 Steeda...... **Winning**

Last edited by Exia; 08-11-2012 at 05:19 PM.
Exia is offline   Reply With Quote
Reply

Bookmarks




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On




GM Truck Forum
Ford Raptor Forum
Chevy Tahoe Forum
Chevy Cobalt Forum
Chevy Camaro Forum
FJ Cruiser Forum
Ford Truck Forum
88-98 GM Truck Forum
73-87 Gm Truck Forum
Dodge Ram Forum
Chevy Equinox Forum
Chevy Cruze Forum
Jeep Liberty Forum
Jeep Forum
Dodge Ram SRT10 Forum
Chrysler 200 Forum
Scion xD Forum
Scion xB Forum
Dodge Challenger Forum
Scion FR-S Forum
Softball Forum
SRT Forum
Nissan Titan Forum
Buick Enclave Forum
Cadillac Forum
Cadillac XTS Forum