light came on about time for emissions...changed up and downstream sensors but code keeps coming back. Is there any chance that I am having problems because of the build date of my car? 05 engine with 06 build date, 06 build date with 07 engine???

 

Just found out that 07 didn't have 3.5 so it would have to be from 05 which does show a different part number for the upstream sensor.

 

what are the codes for the check engine light first of all