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No.. but before you think about replacing them, i'd go to a good exhaust shop and have them test the cats..if they are bad i would just put 2 new cats on.
Although it isn't advertised to do such, in the not recent past I've had moderate success in "cleaning" cats in older vehicles with this WYNNS product. With several bottles added to the fuel system it will also let borderline vehicles "sneak" past the old sniffer tests. Keep in mind this was pre-OBD. You'll have to locate a dealer or professional garage to get it since it isn't available retail.
WYNNS EMISSION CONTROL PN.67910
Add to fuel tank for lower emissions and better fuel economy.
* Reduces tailpipe exhaust emissions in gasoline and diesel engines
* Helps eliminate "rotten egg" odor
* Keeps fuel injectors clean
* Use in gasoline or diesel
* Contains no alcohol
* Removes water from fuel tank
* Patented formulation
* Reduces black soot exhaust from diesels
check engine light was on and said one o2 sensor was out. When i replaced the one it said the other three were out and that my cats were needing replaced. Cant remember what the codes were, it was about 5 months ago. I replaced all o2 sensors but light is still on. Also in my county we don't have emissions testing so, any solution would help as long as it is cheap. I'm a waiter so strapped for cash.