Jeep Code P0420 How To Fix It

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I have a 2012 jeep wrangler 2.6l i'm getting codes p0300 & p2308, srry 3.6l motor, p0300

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Any fix for code p0420 after installing manifold with no pre-cat? see comment for details

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Why am i getting p0420 and p0430 code at the same time? cause & fixes?

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