the old P0401 trouble code over there.. will cover your taurus as well
as the contours..... one is to clean the manifold by pulling off the
throttle valve body and pulling all the carbon deposits out of the
openings.. i had the P0401 on my 96 contur and changed out the EGR, the
EGR vacuum modulator and still have the problem code and will get to the
cleaning behind the throttle body when i get a chance to get to it....
been like this for about 2 yrs. now... no problems running the car, just
the light stays on... i can get it to go out by disconnecting the
battery but it comes back after two cycles in the car start up.....
is probably the heat that is swelling the pipe or fitting and not
letting you take the tube off.. on my 96 contour V-6 enginer 2.5 lt. the
tube came right off.......
it looked a lot tighter than it was.. just one sharp pull on the wrench
and it was like hand tight.....
You might want to spray some liquid penetrant on connection from the exhaust
manifold pipe to EGR valve. Let it sit for an hour or so, or, overnight if
you have the time.
I had the same code, P0401 on a 98 Taurus, took the EGR valve off, only to
find it was still good. The real problem was the Backk pressure sensor/DPFE/
PFE sensor. If and When you replace it, pay attention to how the two hoses
are hooked up. The REF port is hooked to the hose from the lower part of the
pipe nearest the exhaust manifold.
I, and many another, have had this problem. The DPFE sensor is a common
problem on this car. Replaced it on mine and it went away. Luckily I have
a datalogger and was able to log the voltage out of the sensor while driving
with the old and new one.
You said that you replaced the EGR valve, I'm guessing that didn't work, or
at least might have for the time being? I wonder if it's too late to return
it if you just need the DPFE sensor.
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