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What is diagnostic trouble code p0420 in in 1996 Chevy Caprice?

Anonymous

∙ 14y ago

Updated: 8/18/2019

Trouble code P0420 means:Catalyst system efficiency below threshold

Wiki User

∙ 14y ago

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P0420 is a Catalytic Converter efficiency failer. More than likely you will need a new Catalytic Converter.

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For 1996 and newer Trouble code P0420 means:Catalyst system efficiency below threshold (bank 1)

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