IF YOU GET A CODE P0420 or P0430, THE LAST THING YOU WANT TO DO IS CHANGE THE CATALYTIC CONVERTER.
Here at Yogi Auto Parts, we cannot emphasize the importance of consulting a profession for proper diagnostics of the cause leading up to the catalytic failure. This information is for reference only. We are not car care professionals. This information has been provided to us by the manufacturer. It is the buyer's responsibility to verify and fact check this information.
Catalytic's do not go malfunction for no reason. Mechanical malfunction in a catalytic converter is only caused by other mechanical issues/failures. Rust and/or external physical stress would be considered the only exceptions to this information.