I recently suffered the very common P0401 error code on my 2002 F150 4.6L 4×4. I spent hours researching the problem on various forums and YouTube. I decided…
P0401 2002 F150 EGR System Overview and Troubleshooting Guide
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Hi everyone! Mine is a 5.4 and looks like is a ver y similar problem, how
different is the 4.6 to the 5.4 f150! Cause mine is a 02 Harley Davidson
could you get me an advice please, because when is cold looks like it has
problem to run properly and when is warm runs better I don’t know if
something is stuck on the houses or the EGR get stuck when cold! Because
when it warms I can hear something pops out like something just open and
start running properly ! Would you mind to give me an idea or help me out,
because I’m stuck here!
Hi Everyone,
Best video I have seen so far on EGR! My 2002 Ford Escape has a P1406(down
stream differential hose tube off or plugged.) According to your trouble
shooting procedure, I think it is the EGR valve that needs cleaning or
replacing. Do you have any suggestions?
You did an excellent job Vicos! I hope you provide more videos. My
husband was a mechanic and also commented on how SO many ppl get ripped off
by a lot of unscrupulous guys – and you got hit TWICE!! It showed great
self control not to publish the jerk’s names I swear. Thanks again!
Vanessa
Great informative video. I have a 99 Expedition with a p0401 code. After
searching on YouTube, I applied vacuum to the EGR valve and the engine
stalled like it should. I then figured that it had clogged passages. I
decided to clean them myself. They were dirty but not clogged. After a
thorough cleaning along with the throttle body, I reassembled it and
cleared the code. It came back on after about 50 miles of driving. I then
checked all the vacuum hoses for leaks. I found a couple of small rubber
hoses with cracks in them which I replaced. Again I cleared the code. It
just came on again tonight. My next test will be the DPFE sensor and the
EGR solenoid. I don’t think that there is anything else to check. I also
don’t like to throw parts in without testing first. I enjoy videos such as
yours and learn so much from them. Thanks again.
I’m getting a P0171 and p0174 (system too lean bank 1 and 2). I blew smoke
into the intake system and found smoke coming from the actuating “stem” of
the EGR valve. if you look under the valve with a flashlight and mirror you
can see what I mean. could this be the problem? has anyone heard of vacuum
leak from the EGR valve as I have described? by the way great job on the
video very helpful
very well explaned thanks so much for your video great help to me just one
thing tho who were the dodgey mechanics just so i can avoid using there
company name if there a wide spread branch thanks ben
Thx for this it was very informative. I’ve been dealing with this problem
on my ’98 f-150 since I bought it. Each year finding a way to keep
that check engine light off long enough for inspection only for it to come
back on my way back home. That’s the funny thing is overall my truck runs
great except for an occasional dip or surge in idle when I am stopped at
lights and such. Well it’s inspection time again and your help in narrowing
down this problem is greatly appreciated…new insight for sure. I only
wish my channel had something informative for you but if you got time to
kill and are looking for a laugh by all means check it out.
does this cause it to run a little rought all the time and extremely bad
gas mileage? 5mpg is what im gettin on my 98 f150, and running rought all
the time.. i just scanned the code and its the same one P0401
thanks for the info dude this helped a lot
Thanks for the valuable info.
What’s really disgusting is that all of these problems are caused by a
bunch of federal regulations which force the manufactuerers to put all of
this useless junk on the engine. (which then causes tons of mysterious
problems which takes tons of money to fix)
Fucking govt.
I found a flexible drill bit tool called “The Snake-Bit” online for about
$30.00. It comes in sizes 12″-21″ long and you insert it into your clogged
EGR passages to clean out the ports. I will be attempting to clear my
low-flow EGR codes this afternoon, it looks like this is the only tool that
will best clean out those passages.
I got a totally different evaluation from the diagnostic test at advanced
auto, p0302 cylinder 2 misfire & p0316 misfire on startup first 1000
revolutions.
Gotta 2002f-150 also and this past winter increased my problem
dramatically, as before when there was dampness or rain in the air my
engine wouldn’t run properly as to shake at certain speeds and I’d have to
give it gas to “shake off” the irregularity.. Then after 20 min. the engine
light would go off as if my truck “warmed up” so to speak. But now “it’s
sick”, the engine light stays on and I have to keep the accelerator at
certain degrees so the engine doesn’t shake like crazy. Nice video, I’m
about to see what I have to go through now.. I’ll let you guys know.
Thanks for taking the time to put this video together. It was very helpful
and I feel I have a better understanding of the EGR system on my truck.
Great video, thanks for taking the time to post. Easy for a dumb technician
like myself to follow!
Nice vid. Helped me understand the EGR system and how to troubleshoot for
future reference.
where is located this part I have the same problem thanks
Good info.
Great Video
Ended up pulling off the throttle body and my EGR ports were both
completely plugged. put everything back together and truck runs perfectly
but of corse the check engine light is still on.
any ideas?
Hey, thanks for the video. I have this code on my Mercury right now. My
brother, who was a Sr Master Tech at a Ford dealership said it is probably
the DPFE sensor. I am like you though, I don’t want to just “throw parts at
it” so I am going to test the sensor (easy with a multimeter), the EGR
valve (with a hand vacuum pump) and the solenoid (also pretty easy with a
jumper wire/ test light, and a multimeter). My understanding is that the
source vacuum going to the EGR solenoid (red tube in your video) has to be
sufficient to fully open the EGR valve, since that is the actual vacuum
that is normally used. The solenoid just opens to allow the vacuum to be
applied. I believe you may have had a leak in your vacuum line connection.
Thanks again for the video!