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Re: having problem with my check engine light
P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
A number of things can cause this. What exactly is it saying about cylinder 1? If it is a misfire it could actually be causing the p0420 code.
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2001 cougar 2.5V6 AUTO Trubendz catback,SVT uim and TB,K&N intake and someother non performance stuff
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