Honestly, if you got it from a family member, then it's just a fluke it happened now. As far a misfire is concerned, that is one of the most common reasons a catalytic converter gets damaged. What happens is often times raw fuel is introduced into the exhaust/converter due to it not burning in the cylinder. As a result, the temperature in the converter increases and it will basically melt down.
If there wasn't a misfire prior and not one now, that is not a likely cause.
Wednesday, April 22nd, 2020 AT 4:09 PM