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Discussion Starter #1
i have installed a cool air intake system after amouth or so i had a new magnaflow exhaust including catalylst and two new o2 sensors a and now i get a chech engine light code po420 cat effy below theshold (bank 1 ) before the exhaust was install i never got a cel on at all now it keeps coming bank any help to solve this problem or do u think i got a bad cat.
 
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