Father Guido

I got the above code on my 99 Taurus, does it mean the EGR valve is
clogged and needs replacing. Or isn't it quite that simple?

Comments welcome. Here's the rest of the codes involved with the
Exhaust Gas Recirculation...

P0400 -- Exhaust Gas Recirculation Flow Malfunction
P0401 -- Exhaust Gas Recirculation Flow Insufficient Detected
P0402 -- Exhaust Gas Recirculation Flow Excessive Detected
P0403 -- Exhaust Gas Recirculation Flow Circuit Malfunction
P0404 -- Exhaust Gas Recirculation Flow Circuit Range/Performance
P0405 -- Exhaust Gas Recirculation Flow Sensor A Circuit Low
P0406 -- Exhaust Gas Recirculation Flow Sensor A Circuit High
P0407 -- Exhaust Gas Recirculation Flow Sensor B Circuit Low
P0408 -- Exhaust Gas Recirculation Flow Sensor B Circuit High
P0409 -- Exhaust Gas Recirculation Flow Sensor "A" Circuit

Thanks,

Norm

PS I reset this code for the moment. Three weeks ago I had an O2
sensor code (P1131), which I also reset, and so far (knock on wood)
it hasn't returned or even been pending yet.

Backyard Mechanic

Probably needs cleaning at the least. This includes the ENTIRE system..
from exhaust to intake egr port

Father Guido <FG@SNL.com> wrote in
news:55vjc1lq1002lrgsv5469sh1kk6ouftcur@4ax.com:

> I got the above code on my 99 Taurus, does it mean the EGR valve is
> clogged and needs replacing. Or isn't it quite that simple?
>
> Comments welcome. Here's the rest of the codes involved with the
> Exhaust Gas Recirculation...
>
> P0400 -- Exhaust Gas Recirculation Flow Malfunction
> P0401 -- Exhaust Gas Recirculation Flow Insufficient Detected
> P0402 -- Exhaust Gas Recirculation Flow Excessive Detected
> P0403 -- Exhaust Gas Recirculation Flow Circuit Malfunction
> P0404 -- Exhaust Gas Recirculation Flow Circuit Range/Performance
> P0405 -- Exhaust Gas Recirculation Flow Sensor A Circuit Low
> P0406 -- Exhaust Gas Recirculation Flow Sensor A Circuit High
> P0407 -- Exhaust Gas Recirculation Flow Sensor B Circuit Low
> P0408 -- Exhaust Gas Recirculation Flow Sensor B Circuit High
> P0409 -- Exhaust Gas Recirculation Flow Sensor "A" Circuit
>
> Thanks,
>
> Norm
>
> PS I reset this code for the moment. Three weeks ago I had an O2
> sensor code (P1131), which I also reset, and so far (knock on wood)
> it hasn't returned or even been pending yet.
>

lugnut

On Tue, 05 Jul 2005 03:26:50 GMT, Father Guido <FG@SNL.com>
wrote:

>I got the above code on my 99 Taurus, does it mean the EGR valve is
>clogged and needs replacing. Or isn't it quite that simple?
>
>Comments welcome. Here's the rest of the codes involved with the
>Exhaust Gas Recirculation...
>
>P0400 -- Exhaust Gas Recirculation Flow Malfunction
>P0401 -- Exhaust Gas Recirculation Flow Insufficient Detected
>P0402 -- Exhaust Gas Recirculation Flow Excessive Detected
>P0403 -- Exhaust Gas Recirculation Flow Circuit Malfunction
>P0404 -- Exhaust Gas Recirculation Flow Circuit Range/Performance
>P0405 -- Exhaust Gas Recirculation Flow Sensor A Circuit Low
>P0406 -- Exhaust Gas Recirculation Flow Sensor A Circuit High
>P0407 -- Exhaust Gas Recirculation Flow Sensor B Circuit Low
>P0408 -- Exhaust Gas Recirculation Flow Sensor B Circuit High
>P0409 -- Exhaust Gas Recirculation Flow Sensor "A" Circuit
>
>Thanks,
>
>Norm
>
>PS I reset this code for the moment. Three weeks ago I had an O2
>sensor code (P1131), which I also reset, and so far (knock on wood)
>it hasn't returned or even been pending yet.


The most common problem with those is the DPFE sensor which
may give several of your codes.

Lugnut

sleepdog@optonline.net

There was a major recall on the DPFE sensor for many Ford & Mercury
models 2000 and above, not sure if any 99 model years were covered. I
would suspect the DPFE, had it happen to my wife's 2000 Taurus wagon
twice. First was replaced under recall, second I had to do. Part
costs about $30 and takes five minutes to replace on the Taurus. Small
hands help because it is located between the firewall and the engine,
at least it is on the DOHC Duratec.

You might be able to tell if the sensor is bad by checking the DPFEGR
pin on the sensor. Remove the wire harness from the sensor. Looking
at the pins locate the top or left pin (depending on your engine it
might be different). With the key on and engine off check the voltage
to that pin. From what I am reading if it is between 4 and 6 volts the
sensor is bad.

I say "might" because I've never actually performed this test. This I
got from interpreting one of the pin-point tests I have for my 2000
Taurus DOHC. However, if I am in error you count on someone spotting
it and offering additional advice and maybe even a few choice words for
general entertainment.

Jimbo

P0401 almost always seems to require a DPFE sensor replacement. It
worked for mine a few months back. Replacing it also, IMO, removed the
"jerkiness" from the engine on acceleration.

Father Guido

Thanks everybody for your thoughts and ideas!

Norm