Check engine light??? 99 Contour

The check engine light is on on my 99 Contour. I have the codes pulled PO340, PO401 & P1400. The car runs fine, but won't pass emissions. Any ideas??

Looks like you have a few sensors to replace.

http://www.contour.org/FAQ/FAQ.php?s=probs&displayid=10

cam sensorp0340, egr valve or dpfe 1400 1401