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1998 Ford Expedition P0401, P0402, P1401 Engine Code/ A vaccum line could be your problem/ Eps. #89

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In todays video I continue to chase that pesky P0401, P0402 and P01401 engine code!
There is a lot to cover in this video and a few updates after I shot this video.
I AM NOT A PROFESSIONAL MECHANIC AND I AM ONLY TELLING YOU WHAT I HAVE DONE SO FAR TO FIX THIS PROBLEM.
When I bought this truck about a year ago it had around 138,000 and to
day it has 151,000 on the odometer. This truck was a law enforcement truck driven by a detective, NOT a patrol vehicle. The truck was serviced pretty regular but these trucks do have their common issues. I don't really know why the police department sent it off to but i can image it had something to due to its age. I bought this truck from an individual the bought it from the auction. He stated that he had the intake gaskets replaced and a tune-up preformed. The truck ran good and had no check engine lights at the time I purchased it.
Let's talk about the first time the check engine light came on pertaining to the P1401 engine code. This is a DPFE (Differential Pressure Feedback Sensor). This sensor is located on the drives side of the engine up near the EGR valve. I stopped in to a local Autozone store to have them read the code and was told this sensor would fix the issue. Now this truck still had the original DPFE sensor so it needed to be changed away. THIS DID NOT FIX THE PROBLEM.
This became intermittent and seemed to really act up when conditions were wet outside. The engine would miss fire and the engine would stumble all over its self. Now with that being said the check engine light would come on and then flash to indicate a misfire. When I would scan the engine codes it would show up as P0401 and P0402. This was very puzzling for me so I started watching every video I could watch on this topic.
The right thing to do is not what I did which was throw parts at it. I put a new EGR valve and removed the throttle body spacer and cleaned the heck out of it. Well that dang code came back intermittently, again!
I am getting a little irritated with this truck to the point of almost just buying a new truck and that leads me to want is in this video.
Please watch this video to see what I did.
UPDATE:
After filming this video I drove the truck about 120 miles in the snow and guess what came back? That P1401 engine code! When I got to my destination I popped the hood and noticed that I forgot to plug up my DPFE sensor. LOL.
Since then I have driven about 600 miles with no more check engine lights.
Thanks for watching!
Our email is
theznutzgarage@gmail.com
Want to mail us cool automotive related products? If so here is our address.
Thez Nutz Garage
82 Bobby Burgess Rd
Trenton, Tn 38382

Опубликовано:

4 сен 2024

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Комментарии : 49

@reyesgarcia2832 2 месяца назад

I have a 2000 4.6 f150 and have been having this P0104, restricted fuel issue for a loooooong time. My gas milage has been stupid crazy low. It's a good thing i dont do a whole lot lol. I have replaced the 3 things you mentioned and sooo much more 🤦🏽. I have asked people, searched video after video, and forum after forum, and no one could help. Although i haven't checked the side canister yet, as it is almost 11pm, i will definitely be doing this first thing in the morning. I really appreciate you putting this video together and explaining as awesome as you did. This is the only video of yours that i have seen so far, but i have subscribed and will definitely let people know of your channel. Thanks again!

@MrHappy-hs6sn 3 месяца назад

Hell yeah! Your video fixed my egr/misfire codes. I hit an elk on the passenger side years ago and broke a little piece of the corner of that reservoir off and there was a huge hole in it. I put some gorilla tape over the top of it and reinstalled it and truck runs great good gas mileage thank you. I had no idea that damn thing was there. I was throwing parts left and right at this thing. I'm thinking about boxing up all those new parts and putting the old ones back on and getting my money back. 😁

@jaredadams5194 Год назад

I keep getting an intermittent P0401 code and negative fuel trims...I have literally replaced EVERYTHING in the EGR system. EGR valve, solenoid, DPFE, EGR tube, and vaccum lines over to the passenger side. This was pretty informative, I never checked the lines that far down. I now have a new direction to go. Excellent video!

@ThezNutzGarage Год назад

I think you can chase that code forever. I no longer have that truck but I would love to have another one.

@jaredadams5194 Год назад

@Thez Nutz Garage I have an 03 F150 Lariat 5.4, it's in excellent shape for being 20 years old. Just under 139,000 miles on it. I have replaced several things on it, now I'm just dealing with the negative fuel trims...which I'm assuming are caused by the P0401. 🤔

@ThezNutzGarage Год назад

If I remember right a vacuum leak can mess with fuel mixture due to to much air than fuel. The guy that would know is @fordtecmakeuloco for sure.

@jaredadams5194 Год назад

@Thez Nutz Garage From what I've been seeing, it's usually positive fuel trims for a vaccum leak. I could be wrong though. After watching your video yesterday, I did what you did (minus checking the solenoid, as it's brand new) and everything seemed to be okay on that side. My truck only has the one vaccum chamber though, on the back of the battery box.

@jaredadams5194 Год назад

@Thez Nutz Garage I've also made a home made smoke generator to check for leaks. Mainly because I replaced my intake manifold on the suggestion of a mechanic. I was having all high positive fuel trims, and after replacing the manifold those all went away.

@jw4407 2 года назад

Thanks for the video, currently working on a p0401 code and has me stumped, here's a little background on what I'm dealing with. I have a 2001 navigator 4x4 I had a broken pressure sensor which was giving me a p1401 code I replaced the sensor cleared the code and put truck though drive cycle and went to get truck emissions tested while waiting in the line for that which was pretty long and truck running low on gas I had to keep shutting the truck on and off by the time I was ready to pull in for the emissions test my check eng light popped on throwing a p0420 code of course the truck was going to fail so proceeded on through and left cleared the code out thinking that having to shut off and on so many times that it may have triggered the code. Put more gas in truck to where I wouldn't have to run into that problem again with having to sit in a long line without having to shutdown my truck again well went through the drive cycle again now p0401 popped up. Since I already replaced the pressure sensor I went right for the egr which I had to pull the upper intake to get to the egr since I was that far into already I replaced the egr since it's still factory original and 22years old I was not taking any chances while I had the intake off I proceeded to clean the intake and make sure I had good flow through all vacuum ports once I cleaned that all up I went ahead and cleaned out the egr tube to the exhaust and made sure I had good flow through the tube and good flow through the lines back to the pressure sensor. Put everything back together figured that should solve my problem. Well the code returned. At this point I'm frustrated checked to see if I had vacuum at egr solenoid found no issue there I had vacuum went ahead and replaced the control solenoid since it's over 20 years old also figured why not. Well still getting this nasty p0401 code. At this point just think I've gotten a new defective part but no way to check the electronic parts since someone decided to walk into my garage while i was in the house trying to cool off from the heat and helped themselves to some of my tools and scanner and multimeter just made a bad day into a worse day. So now I'm on hold till at least get a cheap multimeter. Hopefully I'll get back to let you know what is wrong

@ybsmike6512 9 месяцев назад

I have the exact same problem and code 1401. Replaced the EGR Sensor, EGR, plugs, wires, coild, grounds and still having it after 2 years. Its a 99 F250 with the 6.8 V10. Nightmare issue but this vid helps.

@armandokhansr4163 2 года назад

Thank you for making this video it is very helpful , I got a 2003 F150 check engine light on, code p0402 , I am going to work on it this weekend and find out what vacuum lines are Bad

@devinnewell2615 10 месяцев назад

I’ve been looking for a video or diagram of these vacuum hoses for an long time, I’ve finally found it 💯. Thanks

@ThezNutzGarage 10 месяцев назад

Glad I could help

@green2life Год назад

Thanks for the video. I have 98 Expedition 4x4 chasing same dern code. Your explanation is great! I'm about to try the first cople steps you mentioned near the end. Check back in as I go.

@ThezNutzGarage Год назад

Let me know what happens.

@green2life Год назад

@ThezNutzGarage working your suggestions led me to find other issues. Fixed these issues - vacuum lines not reconnected by prior service tech. Thank you for all the effort to make this video.

@cashncoffee 4 месяца назад

Great job explaining this!!! I’m having a problem with a 98 Expedition . I idles but when I give it fuel it hesitates and won’t move at all.

@dmope22 Год назад

thanks for the video. I am also having those codes on my 1999 mercury mountaineer. It is really annoying trying to find the problem. I also changes out the EGR, EGR solenoid and DPFE. the problem is still there. cheers

@ThezNutzGarage Год назад

Yeah that code you can chase for a while.

@jaredadams5194 Год назад

When you mentioned Auto Zone not having the correct line, Oreillys here in the town where I live is the same. I've had to order a lot of my fittings from Amazon, but I have used fuel line for several of the connections.

@vincebowling1778 11 месяцев назад

I bet your a/c and heater operates better as well also. The heat exchanger needs good vacuum to switch over correctly and stay in position.

@frix57 Год назад

Thank you. Very informative video and you're easy to listen to.

@teresaaltman3327 2 года назад

Very interesting. I like watching your videos!!

@ThezNutzGarage 2 года назад

Thanks for watching!

@kenalford2417 11 месяцев назад

Thanks good info

@ThezNutzGarage 10 месяцев назад

Glad it was helpful!

@bradgann6880 Год назад

Good deal man. I got a 97 f150 n that's something I've been chasing last couple years probably. Haven't pulled fender yet bc working outside this time of year kinda afaird what it'll turn into. Trucks runs good and when I unplug vaccum it doesn't change enough to tell. I've actually burned 2 ck engines lights out before. But forget n when changed cluster bulbs to blue led put 1 another bk in. Every time I turn off with obd scanner within a week it's back. Neway enjoyed your video n understand system better now. I think🤔 But on that egr vac sensor thing kinda confused. Tired a couple from scrapyard but they may or maynot. But with solenoid If I have resistance of power then it ok? I can pull vac of all 3 n crank put on no diffrence. The ck engine 🔜 light aggrivates me when it gotta be something simple best solution I've had was put a picture over it n let her burn. Awful gas mileage though. She's got over 300000.

@bradgann6880 Год назад

Mines a 4.6 if any n all suggestions appreciated.

@KevinFreist Год назад

your v8deo was helpful. saved me some grief.

@chrisrode3208 Год назад

Informative. Thank you

@teddyyngoc7478 2 года назад

Thank you ... best video I've seen..

@ThezNutzGarage 2 года назад

Thanks for watching.

@yasmin-bw5uz Год назад

Thanks a bunch

@DIYRANGER 8 месяцев назад

where does the white vacuum line under the egr solenoid connect to?

@ThezNutzGarage 6 месяцев назад

I would got look at the truck but I killed it so I no longer have it. You can Google the vacuum line layout online

@robertwoodward388 Год назад

That's what she said my hose was to small and short ?????

@ThezNutzGarage Год назад

Comedy classic!

@skulledmonte84 2 года назад

If memory serves me 1999 5.4 4wd Expedition's doesn't have that black box or all those vac lines on passenger side wheel well ?????

@ThezNutzGarage 2 года назад

Well mine is a 1998 expedition 4x4. My 1999 f150 was a two wheel drive and I really don’t know about where the lines run on a 99 4x4 but maybe someone will give us that information.

@KevinFreist Год назад

no , you had it right .that was one a them dumaflachies. those are emgineering marvels. 🤣

@ThezNutzGarage Год назад

😂

@KevinFreist Год назад

@@ThezNutzGarage yea ! those dumafluchies replaced those friggin whatchmacallits . those damned engineers .they'll reinvent the wheel till it does everything but roll. 😂