I put a Mac h-pipe on last night and today the service engine light came on. I had to replace one o2 sensor with a Bosch O2 for the for passenger side cause the one wouldn't come out of the stock pipe. They didn't have any 04 o2 so I got one for a 03. Is the a difference in the o2's from 03 to 04. This is also making the Mil eliminator on that side read bad to, Do I need to get a Ford o2 to see it that the problem or can it be the Mil eliminator on that side making them read bad?