![]() ![]() 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 Equinox’s PCM believes that the catalytic converter is no longer doing its job. These readings shouldn’t match since your Equinox’s catalytic converter is scrubbing 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 vehicle will throw the service engine soon light (P0430). Efficiency Below Threshold An upstream O2 sensor Oxygen sensors measure the gasses that enter and exit your Equinox’s catalytic converter. A modern catalytic converter should pull over 95% of these pollutants out. Catalyst system efficiency measures how many chemicals are removed from the exhaust system. Your Equinox’s exhaust contains hydrocarbons, carbon monoxide, and other harmful gasses. P0430: Catalyst System Efficiency Below Threshold (Bank 2) Catalyst System Efficiency Here’s the technical definition for your Chevy Equinox: P0430 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 P0430: Catalyst System Efficiency – Below Threshold (Bank 2) P0430 is usually caused by a catalytic converter issue or a bad O2 sensor. P0430 is an emissions-related trouble code and is virtually never a breakdown risk. ![]() It covers the P0430 code’s meaning, symptoms, causes, and possible solutions. This page is meant to help you troubleshoot the Chevy Equinox P0430 trouble code. ![]()
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