EGR insufficient flow code showing
 

I am sorry I posted in a wrong format. I am new and am not familiar with all this yet.
I have a 2002 F-150 that is showing a code indicating "EGR insufficient flow". I replaced the EGR valve and cleared the light/code, but the "check engine light" keeps coming back on and code indicates the same problem. Any suggestions on what may be causing the light to keep coming on, even after replacing the EGR valve?
Any help would be appreciated.
Thanks,
Dave

What code are you actually getting?

Still getting my feet wet on this site. Don't know if my reply got to you ( Kevin ) or not. I sent it personal to you. Let me know, please.
Thanks

You have a bad DPFE sensor - if you have a 4.6 you will also need to take off your throttle body and clean out your EGR ports.

Thanks much for taking time to respond. I will try to remedy the situation ASAP.

I think ccoram has the correct awnser Ford egr valves rarely fail the most likely cause of PO401 codes is a faulty DPFE sensor (available only from Ford)

Actually you can save yourself a lot of money and if you have the big style DPFE Oreillys sells it boxed as a Borg Warner brand for $47.00. Its the new style black plastic and it is a OEM one. Evidently Borg Warner makes the OEM or the other way around. Its even got the FXXX factory Ford number on it.

thanks ccoram for the info on the oreilly DPFE. i will check into it.

I had the same problem with my ford, and it was the DPFE. Just make sure you reset the computor.

thanks to all who were kind enough to take the time to respond to my problem. i replaced the DPFE part and reset the computer. (by disconnecting the negative terminal, for a short while, i was told..) and will see if the "check engine" light comes back on.
thanks again,
dave

have a F-250 with a 5.8 auto, 4WD, that when i start it, i get raw gas fumes through the air vents. i also get no power out of it. first thing in the morning, it's starts good, but after that, it takes a lot of cranking before it starts.
any help would be appreciated.

I had the same problem with my 98 Expedition. Last year I replaced the EGR valve, EGR sensor and reset the codes. The light still came back on. Being ignorant I got fed up and took it in to the dealership. $1000 later the check enging light was off. I have to say at this point that they replaced many other things they thought were worn out.

A week before I had to get the inspection done this year the CEL came back on with the same codes, "EGR Flow Insufficient". My friend. I was not going to take it back to the dealership again after last year. I took off the EGR Valve and cleaned it and made sure all the hoses were clear to the EGR sensor. I put it all back together, reset the codes and completed the drive cycle. The light came back on.

I slept on it for a day and looked at all the places the EGR tenticles led. My last resort was to look at the EGR ports that led to the throttle body. I took of the throttle body, for the first time ever and the ports were caked shut with carbon build up. I cleaned them with an old riffle cleaning wire brush, reset the codes and the light has not come back on for a few days now. You may want to try this before buying a new sensor. I would much rather spend the 2 hours it took to clean the ports that lead into the throttle body then to pay the dealership a few hundred dollars to do the same thing.

Only do it if you are confortable with it thought.

Davenpt, I too had the same problem with my 2002. Yours is a 4.6 I take it? Does it have low miles? I had about 40k miles on mine when I got the code. DPFE sensor cured it. Mine was done at the dealership for FREE because the warranty was extended for this part. I thought it was mileage limited, but it may be time limited as well. It is worth a shot if you have low mileage. If this is on a high mileage truck, the EGR ports may need to be cleaned as stated above.

I have had this in the past. It was caused by a clogged fuel filter. It tripped the sensors.. Try that first and reset and see if it goes away.

DPFE sensor? I am slow, what is that?

DPFE = Differential Pressure Feedback Exhaust (sensor)

if the code is p0401 replace the dpfe sensor

thanks for all the info, guys ( or gals). i did end up changing the EGR valve and the sensor, and the light still came back on. i will try the suggestions in order of simplicity, and see what happens. i still only have 33K miles on the truck. seems to run fine. so i don't know if whatever is causing the light to be on, is hurting anything or not. does anyone know if it might be bad to drive while the light is on?
thanks again for taking time everyone...
dave

I still say try the fuel filter.. around 15 bucks and easy to change.. I changed my DPFE and also cleaned the ports and finially replaced the egr valve.. No luck.. Then somewhere on here someone suggested the fuel filter. IT WORKED! Just remember to use the fuel cutoff switch or else you will get a mouthfull of gas... (around 10 bucks in gas) lol

Don't forget, you also need a special tool to release the fuel line connectors. If you don't have one already, any auto parts store should have one.

you need someone to clear the codes form the pcm so the light will go out.it will not clear by itself. sometimes disconnecting the battery will work but not always.its not dangerous to drive around with the check engine light on but if something else happens with your emissions system you will not know there is something wrong because the light is still on. so have someone clear it and shut the light out.

I know I am waking up a really old one here.....
 

But can someone tell me how a fuel filter can cause a P0401?