CEL, P0401, EGR flow insufficient - Honda Prelude Forum

Zbone · 03-02-2006, 01:09 PM

Is there any difference between this code and the 80 code? same remedy of cleaning the EGR tube as duscussed many times before?

<------- thankful it wasn't something worse...

Prelude1897 · 03-02-2006, 02:08 PM

Clean out your EGR valve and see if that helps you out...While you in the same spot, you should take your IAC valve off as well and clean that

camarokiller · 03-02-2006, 03:58 PM

What is code 80? I have never heard of that. I thought the codes start at 100 and go up from there. Anyway, sometimes the line going into the EGR valve gets gummed up, so you might check that too.

Zbone · 03-03-2006, 06:53 AM

Quote:

Originally Posted by camarokiller

What is code 80? I have never heard of that. I thought the codes start at 100 and go up from there. Anyway, sometimes the line going into the EGR valve gets gummed up, so you might check that too.

I did a search and for some reason people were calling it a "code 80..." I don't know where that came from either.

does anyone have the link handy to the origional writeup for this fix? I tried searching, but to no avail...

Also, anyone that's done this is welcome to post any tips; they would be much appreciated!

scalawagd · 03-03-2006, 11:33 AM

Quote:

Originally Posted by zbone

I did a search and for some reason people were calling it a "code 80..." I don't know where that came from either.

code 80 is found when you get the CEL and jump the ECU to read the code... check engine light flashes 8 times then 0 times = code 80.

SlowSi · 03-03-2006, 04:04 PM

The RIGHT fix is to remove the IM, clean the hell out of it, put a new IM gasket on, and reinstall the IM.

camarokiller · 03-03-2006, 08:30 PM

To answer your original question, there is no difference between the codes DTC P0401 and MIL code 80, they are the exact same thing. I never get the MIL codes so I wasn't familiar with 80, but like SlowSi said, cleaning out the EGR port inside the IM, as well as cleaning the EGR valve and line, should fix your problem. If not, you have a bad EGR valve and it needs replaced. I too am getting EGR codes now, so I plan to do this next weekend.

Zbone · 03-06-2006, 07:43 AM

Quote:

Originally Posted by camarokiller

To answer your original question, there is no difference between the codes DTC P0401 and MIL code 80, they are the exact same thing. I never get the MIL codes so I wasn't familiar with 80, but like SlowSi said, cleaning out the EGR port inside the IM, as well as cleaning the EGR valve and line, should fix your problem. If not, you have a bad EGR valve and it needs replaced. I too am getting EGR codes now, so I plan to do this next weekend.

Do you plan on removing the entire IM, or are you going to clean it on the block?

camarokiller · 03-06-2006, 11:14 AM

I am actually planning to remove the IM and replace the gasket with the Hondata one while I'm at it. Isn't the IM 2 pieces though? Shouldn't you be able to remove the top half for the cleaning and leave the bottom half connected to the head? I wish I could tell you for sure, but I've never removed the IM before. If I were you I would just clean the EGR valve and line first, it may not be necessary to clean the IM. Have fun!

WolfpactVI · 03-06-2006, 12:37 PM

How to install an aftermarket Intake Manifold Insulator Gasket (like Hondata)

Make sure you have a new gasket ready to replace the one that goes between the upper and lower halves of the IM.

- Wolf

lude007 · 10-17-2006, 07:27 AM

Grrrggg just happened to my car too yesterday, P0401 EGR flow insufficient code. Now i have to troubleshoot this problem. Besides the ideas above, is there something else i should check? i had an RS*R Exmag catback for almost 3.5 yrs.

Help With CEL

lude007 · 10-17-2006, 04:57 PM

ECM reset, the CEL is disappeared

let see tomorrow if it's comming back or not, intermittent failure?

mustangtw5901 · 10-17-2006, 06:15 PM

I had the same egr problem with my car, 97 base with 208K miles. Cleaning the EGR valve alone did not fix it, still got the insufficient flow code. What I did next was clean out the egr ports in the IM. You do not have to take the IM off to do this. All you need to do is go to the dealer and get some new brass EGR port plugs. Then what you do is drill a hole through the original plugs in the manifold, and use a self taping screw and slide hammer to pop them out. Now you have access to the EGR ports for cleaning. When your done, get a punch and hammer and tap/press the new brass port plugs on. My ports were all gummed up with carbon and after cleaning them, the CEL went away

Kap TypeSH · 10-18-2006, 11:42 AM

yea i got this code too

lude007 · 10-18-2006, 08:42 PM

Quote:

Originally Posted by Kap TypeSH

yea i got this code too

Oh-uh dude, take the 7.5A Clock Fuse for 20 seconds then put it back or try Mustang5901's method

PearlH22 · 10-18-2006, 10:50 PM

I ordered my caps from Honda but they don't look like the ones that are in there now, they look like little caps. Are these correct? Also, is there a way to get the old plugs out without a slide hammer or self tapping screw?

mustangtw5901 · 10-19-2006, 04:30 AM

The caps are small and they are in front of the fuel rail in the manifold. There are two in the front and four in the back in a line. I just cleaned the back four and that fixed it for me. I think the slide hammer would be the easiest way. I got mine from advance auto parts for like 10 or 15 bucks. Its really called a dent puller and came with several different sized screws.

corpuszero · 01-03-2008, 07:13 PM

gonna bring this thread back alive

i just got a CEL P0401 as well and was wondering exactly where the EGR valve is and what I should do to fix the problem? Thanks!

bb6h23a · 10-14-2008, 10:12 PM

would insufficient flow cause the car to go into limp mode or turn on the rev limiter

pIERCE · 10-14-2008, 10:36 PM

Almost an old thread??? Yeah, old thread man.

Firstly, try searchin for somethin that simple, I think that useless excuse for a "search feature" might actually find you what you're looking for.

Secondly, to not totally contrdict myself from other posts, no, the code "80" or "P0401" WILL NOT cause it to go into "limp mode".

Good luck