If your car pops up a catalyst efficiency code (P0420/P0430) and you look for help on YouTube you will find all sorts of videos about some magic juice called Cataclean. In this video we try out Cataclean, find out what is actually in it and try a much cheaper alternative as well. Will it work? If not what is a kludge/patch/hack that might turn off your CEL for a catalytic convertor that is still mostly OK?
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