I have a 2000 WS6. I had a check engine light on, got it read and it said my cats were bad. I already had 2 high flow cats ready to install so I just disregarded it. so I replaced the stock w/ the high flow cats. and everything behind that. All was good. Now a year later I'm getting the same trouble code. It says may cats are bad. What else could be causing this problem? It wouldnt be the cats again would it?
