Honda Error Code P0420

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How to Fix a P0420 Error Code on a Toyota Corolla – Practical Mechanic

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Check engine light :( . error code p0171P0430 code: catalyst system efficiency below threshold (bank 2) Accord p0420 3l causing mechanicadviceP0171 code civic honda error lean engine too check system light troubleshoot.

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P0420 code: catalyst system efficiency below threshold (bank 1) .