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.
