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Originally Posted by fu03steve
so those 4 bung are for the o2 sensors then huh?
if i was to remove the 2ndary cat close to the muffler...
will CEL turn on/?
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Yeah, it probably will. In layman terms the sensors that were aft of the cats will sense too much pollution and think your cats are not functioning properly so there's a good chance it will trip a CEL light.