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just pokin around to see what cat cleaners you guys have had the best results with, also has anyone used auto rx? what is your experience with it?

so i think i have a bad cat, i believe the code thats popping up is p0421 which ive read basically means the O2 sensors are picking up the same reading, meaning the cat isnt doing its thing. can i straight pipe past it and disconnect that O2 sensor or is that going to give me more problems? im...