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2008 chevy
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16,008 Posts
Discussion Starter · #1 ·
as many of you know i cut off my resonator and then after a while put on a SLP loudmoth II muffler. after a while my CEL came on. i stopped by the dealer they read the code said it was an O2 sensor. i had them clear the code and went on my way, i then had the muffler removed due to some problems with it, so now i have a straight pipe and after a few weeks the CEL came back on, yesterday i went to the dealer and they said it reads "low efficiantcy in cats"

has any one heard of this or had this problem before? i will be changing my PCM/TCM to a tuned oen this weekend will this change anything?
 

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2003 chevy trailblazer_lt
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425 Posts
with not having a muffler, there is no back pressure to the cat and this could be causing the computer to think there is a problem with the cat. just my :m2:
 
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