Sounds to me the dealer is attempting to fix the problem by changing things that
COULD be the problem. You say the car runs fine and there are no other symptoms. If the cats were bad you should (not Always) have some type of sign. Do they get hotter than normal. The way you would know is you would probably feel the heat generated by them through the floor board. Also check them in the dark after the car is warmed up and see if they glow (cherry red). These are both signs of the cats being clogged but you should also have poor engine performance. If you don't have these signs theycould still be badThe o2 senors could be tested with a tester if you have one. If I had to change one or the other I would change the o2 senors first because they are cheaper to replace and more likely to go bad than the cats.
Hope this helps :) Backyardmechanic[/b]
Saturday, November 18th, 2006 AT 5:42 PM