Ok I'll try to answer all the questions.
I need to get rid of the check engine light to pass PRNJ inspection.
She was driving the car for a while with the two bad coils, It did not run right.
I changed them in January, the check engine light was intermediate at first now it just stays on.
The car has 95k miles so that would be good if it is covered to 100k. I call the dealer I guess.
Code is P0430 "catalyst system efficiency bellow threshold bank 2"
Probable cause exhaust leak <does not have.
check other service codes first < don't have any.
faulty catalytic converter
It has upstream on downstream o2 sensors, so I would have to change both to rule them out. I guess at least a 100 bucks for that.
Auto zone was nice enough to give me a print out with the brand and part number for the cat.
Dorman 674-831 $639.00 at auto zone
$350.00 on amazon.
I have another parts store I deal with I could check also, mostly because I despise auto zone.
Its an ugly looking critter also. I haven't looked at the car yet to see how hard it is to change.