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Accord 3.5 oem exhaust11/30/2023 Among the many jobs that oxygen sensors have is they have to measure the emissions levels coming in and out of the converter. Your Accord has at least two oxygen sensors, one before and after the catalytic converter. The code technically stands for:Ĭatalyst System Efficiency Below Threshold ![]() P0420: Catalyst System Efficiency | Below Threshold ![]() It doesn’t matter which model you have, this OBDII code has the same meaning for all of them. This code number references a number that is given to you when you plug your Honda Accord into a OBDII scanner. One of the most common trouble codes with all Honda vehicles is the P0420. In the Accord, OBDII P0420 is often caused by a bad oxygen sensor, but there can be other causes as well. It covers Honda Accord P0420 meaning, symptoms, causes, and possible solutions. ![]() This page is meant to help you troubleshoot the Honda Accord P0420 trouble code.
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