Because it is illegal to drive without a catalytic converter and most states require vehicles to pass smog checks, it is essential that a damaged catalytic converter be replaced.
However, the parts and labor for a replacement make it a pricey service—one that many drivers may not be able to afford.
So, while crucial and necessary, replacing a catalytic converter might not be worthwhile to replace. Looking into selling your car as-is might be a better financial decision.