Chevy Fault Code U0420

Chevy fault code u0420 I'm getting error codes: p3055, u0420-71,c0800-03. 2017 malibu premier Toyota fault code p0420

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Trouble code solution p0420: decoding, causes, resetting, meaning

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P0420 code causes and solutions

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What is the p0420 fault code and what are its causes? .