P0420 i believe is a catalytic convertor efficiency code. if the cat has gone bad, it should be under warranty (emissions items have a very different, government enforced warranty period).
You need a new Catalytic Converter
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P0420 i believe is a catalytic convertor efficiency code. if the cat has gone bad, it should be under warranty (emissions items have a very different, government enforced warranty period).
You need a new Catalytic Converter