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CEL question.

699 views 10 replies 8 participants last post by  stereo 
#1 · (Edited)
i just checked my CEL and its ( p0420 catalyst efficiency below threshold ) i was told this was because of my high flow cat, is there anyway to correct this problem by still retaining my high flow cat? or do i have to use the stock one? thanks alot

tobie

oh and yes ive tryed resetting, it comes back with the same problem =0)
 
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