I have a 2004 Licoln Ls 3.0 6cyl. My check engine light came on and reads for a new catalytic converter. I have lost power in the car and it smells like backed up exhaust. How much will parts and labor run if I have to replace both of them. This car has had several repairs in the last year. Cyl coils, battery, altinator, crank sensor, 4 different oil leaks, and I can't remember but some other sensor too. It has 75k miles and seems to be falling apart.