Service Engine Soon (SES) light decided to
light-up a few days ago, alerting me of a
problem. Oh, great! Called a friend to come over
with his OBDII scanner to pull the code. Shoots back
with the code P0401. Great, now what do I do?
Google (and the forums) to the rescue. After a
few searches and reading some posts, turns out most
people solved the problem by replacing the
(commonly) malfunctioning DPFE Sensor. Call up
my local dealer and the part (FoMoCo#
4U7Z-9J460-AA) was available. Cost $30 + tax.
After picking up
the part I noticed it was a bit different than the
stock 2002 DPFE. The new part is slightly
larger. Great! that should give me a few more HP
:) (joking guys). Don't be alarmed about the
difference, it is the same (improved) part. Next
thing to do is swap the bad for the good. If you
can start your Explorer without help, you can
change the DPFE. No tools are required, bonus!
Note: very slight amount of brain cells will
be used for this repair
Okay, let's start. First thing to do is pop the
hood. If you don't know how, STOP right now and
call up your local dealer to schedule the job.
A little disclaimer before we continue: While replacing the DPFE
sensor solved the problem in my case, it might
not be the same for every P0401. Sometimes it
could actually be the EGR Value or other EGR/DPFE