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Discussion Starter #1 (Edited)
would a failing o2 sensor cause a P0420 or could it really be the cats failing? has anyone heard of a cat failing at only 88K? all i have is a cat-back, everything else is stock. i did a search and all i got was topics on o2 simulators, i don't want to go that route. thanks in advance. -brian
 

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.........bump.........
 
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