Posts Tagged: causes catalytic converter failure

What causes catalytic converter failure and a P0420 code

What Causes Catalytic Converter Failure and How to Prevent It As a seasoned automotive technician, I’ve diagnosed countless emissions-related trouble codes. One of the most misunderstood issues drivers face is catalytic converter failure, and the resulting P0420 or P0430 codes that pop up on a scan tool. In this article, I’ll walk you through what causes catalytic converter failure, what the P0420 and P0430 codes actually mean, and how to avoid making expensive and unnecessary repairs. What a Catalytic Converter Does A catalytic converter converts toxic gases from combustion, like … Read More