![]() ![]() The O2 sensors are not reporting the right readings from the exhaust.The catalytic converter is losing efficiency and needs to be replaced.The exhaust is escaping before it is measured.When the readings from each O2 sensor get close, the software in your Odyssey’s PCM believes that the catalytic converter is no longer doing its job. These readings shouldn’t match since the catalytic converter is supposed to scrub the pollutants from the exhaust. When the readings from the upstream and downstream oxygen sensors show similar readings (not enough pollutants expelled from the exhaust), your van will throw the service engine soon light (P0420). Efficiency Below Threshold An upstream O2 sensor Catalyst system efficiency is the percentage of these chemicals removed from the exhaust system. Your Odyssey’s exhaust contains hydrocarbons, carbon monoxide, and other harmful gasses. P0420: Catalyst System Efficiency Below Threshold (Bank 1) Catalyst System Efficiency ![]() Here’s the technical definition for your van: P0420 is generic (has the same meaning for all vehicles made in 1996+) OBDII trouble code. O2 sensor replacement is easy, but the catalytic converter can be a challenge P0420: Catalyst System Efficiency Below Threshold Honda Odyssey P0420 Quick Info Table Definition P0420 is the most common OBDII code and is virtually never a breakdown risk.Ī failing oxygen sensor or bad catalytic converter are the most common causes of P0420. It covers the P0420 code’s meaning, symptoms, causes, and possible solutions. This page is meant to help you troubleshoot the Honda Odyssey P0420 trouble code. ![]()
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