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If the catalyst is glowing, your running to rich. Working for the dealer I have seen it on several occasions. 1st by sucking a cleaner through a vacuum line, 2nd a faulty ECM with bad parameters and 3rd an injector hanging open. If you want a good fuel treatment try a BG product called 44K which is added to the tank or try a cheaper alternative Chevron Techron. Fuel "induction" cleanings on a fuel injected vehicle do very little, but cost you you money. The cats probably fine however it could have damaged the 02.
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