Honda Civic P0420: Catalyst System Efficiency → Below Threshold → Bank 1 | Drivetrain Resource
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Honda Civic P0420: Catalyst System Efficiency → Below Threshold → Bank 1 | Drivetrain Resource
This page is meant to help you troubleshoot the Honda Civic P0420 trouble code. It covers the P0420 code's meaning, symptoms, causes, and possible solutions. P0420 is the most common OBDII code and is virtually never a breakdown risk. A failing oxygen sensor or bad catalytic converter are the most common causes of P0420. Table
Sep 22, 2018
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