Most likely its your DPFE sensor, or EGR pressure pressure flow sensor..
They are known for goin bad and its about time the first one did on you.. If
you go to the local autoparts store they should be able to get you a new one
for around $50.00..
Another problem that's just as common is plugged EGR passages in the intake
manifold. Here's a link to a Tech article on cleaning them:
Both will set a code for insufficient EGR Flow and without proper
it can be hard to determine which is the actual problem.
The 2 problems aren't related by cause and effect, one doesn't cause the
But, if you change the DPFE, Murphys Law dictates the problem will actually be
EGR passages. Inversely, if you clean the passages, Murphy says the DPFE will
fail also (10 minutes before emissions inspection). :(
I would advise doing both due to the fact that both are very common and
passages can be done for the price of a gasket and a can of carb cleaner.
You can try cleaning the passages first, but remember, the DPFE is a common
item and it is 16 years old.
Before I do that you can check out a post I made in the ford truck group
about 2.3L timing belts.. LOL I jacked that one all to hell... I think its
funny that they said the 2.5L wasnt produced after 01, but the WSM and PC/ED
still list the engine in following years.. :(
Here FT, have some chips? It's a nice corner but I see some cracks. We gotta
custodian on that...
I think its
> funny that they said the 2.5L wasnt produced after 01, but the WSM and PC/ED
> still list the engine in following years.. :(
Hmm, I've seen the 2.5 listed through at least 04 (Ranger?). I've never seen
but I left the business in 01 and went into IT. I'm still "involved" but I don't
the newer models like I used to at the dealership. I can back you up on the
through 04 though.
FTE is a pretty "staunch" bunch when it comes to trucks and what they know
them. They will argue a point into the ground. Some know more than others. It's
pretty good group though. I visit often and post occasionally in the electrical
A little about myself:
I'm originally from West Virginia. I are one, and know first hand that "we"
are really hard headed to the end and it's hard to prove different when "we"
"we" are right. "We" also tend to be very outspoken in "our" beliefs, right or
as long as "we" believe them to be true. Unfortunately many of "us" haven't been
formally trained. Many Rednecks across the country drive Ford trucks, happily a
majority of "us". Ford makes some of the toughest trucks in the US. Hard headed
Rednecks, like me, love a tough truck. That truck happens to usually be a Ford.
"we" Rednecks were to congregate on the Internet in all of "our" stubbornness ,
would it be? Hmmm...
There is no connection intended between this personal FYI and any previous
in this post. ;)
Ummmm.... I might be "flat rate reading"... but I see "check engine light"
and "insufficient flow to cat"..... There's a reference to changing the EGR
Am I the only one that sees a problem here?
While changing the DPFE might fix most CELs on these units, there is a
distinct lack of information....
Thanks for the advice. I was going in that direction I already changed the
egr pressure sensor and egr valve.. Next I will go with DPFE.
Just seems like all we do now is parts change till we get it right.
very sad time for back yard mechanics.
Thanks again Tim
Insufficient flow to cat could mean a a busted catalyst tube, a rubber
section or a broken connector for the stainless pieces. Perhaps not
enough air getting in the cat to "catalyze" the exhaust gasses? Just
a theory. My theory, which is mine...
OK not enough info I get that a lot. the code at auto zone was 401 or 404
sorry can't remember exact code
There doesn't seem to be any vacuum going to egr so it will not open .
However there is vacuum at throttle body when I attach direct vacuum to egr
it stalls the car.
That made me change the egr solenoid.
it made no difference So I started to think maybe a bad solenoid put ohm
meter on it and got conductivity.
The next vacuum part in the line would be DPFE EGR pressure sensor that's a
Thanks again for the help this group is great I'm getting nothing from
Chrysler group all my cars are dying at once.
No problem, you have vacuum, its just not getting routed through the
solenoid to the EGR valve, probably because the computer won't open
the EGR solenoid. One of the inputs to this system is the DPFE
sensor, which measures backpressure between the exhaust and EGR inlet
tube. This sensor combined with others tells the computer how to
modulate the EGR valve open/part open/closed. In very basic laymen's
terms at least.
"Insufficient EGR flow" is P0401, I've had this myself. A new DPFE
can be had at a dealer for about $30, at least in 2004 for my 2000
Taurus. YMMV. Economies of scale might have had something to do with
the low price since at the time Ford dealers were replacing hundreds
per month, perhaps?
Takes five minutes to replace on my vehicle. If you're going to get
this far into auto repair do yourself a favor and get a code scanner
and an alldatadiy account, gives you the pinpoint tests to get a
better idea how to chase these things down.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.