Most vehicle owners don't think about their converters until the "Check Engine" light comes on. In many cases, the vehicle's onboard diagnostic system has tripped a code related to the emissions system. More often than not, the actual problem has occurred upstream of the converter...in the engine or fuel system. These issues can affect how well the converter is able to do its job. Learn more about converters by watching this video.
Why Catalytic Converters Fail- Walker Exhaust Video Series:
http://www.youtube.com/watch?v=7ZbAHTolx4E