Don't go to the dealer, the DPFE sensor is in a hiding place but it isn't that hard to replace. On the Duratec, it's located against the block underneath the throttle body. I had mine replaced by a mechanic, but the best way to get to it is to
a ) take off the intake hose
B ) disconnect the throttle body
c ) replace the DPFE sensor (you'll know what it looks like from your replacement)
And, if you're not sure it's the DPFE sensor, I bet you dollars to dozens it is. I replaced my whole EGR system with the DPFE sensor last before it fixed my CEL. The DPFE seems like the most problematic part on the taurus.
If you look for it and can't find it, I can take my accordion off tommorrow and get you some pictures, if you need. It really isn't that hard to get to once you disconnect the TB, though.
a ) take off the intake hose
B ) disconnect the throttle body
c ) replace the DPFE sensor (you'll know what it looks like from your replacement)
And, if you're not sure it's the DPFE sensor, I bet you dollars to dozens it is. I replaced my whole EGR system with the DPFE sensor last before it fixed my CEL. The DPFE seems like the most problematic part on the taurus.
If you look for it and can't find it, I can take my accordion off tommorrow and get you some pictures, if you need. It really isn't that hard to get to once you disconnect the TB, though.