Honda Accord Error Code P0420

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98 honda accord 2.3l, could this crack in the flex pipe be what is

Honda accord check engine light code p0420 .

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HONDA ACCORD P0420 CODE | Catalyst Efficiency Below Threshold Bank 1

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98 Honda Accord 2.3L, could this crack in the flex pipe be what is

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