Can both catalytic go bad at same time

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. What testing has been performed to determine that you need both catalytic converter's definitively? Yes, they can go bad at the same time, especially if engine performance issues exist allowing unburned fuel to get into each converter and elevate then internal temperature to a damaging level. Have you checked engine performance concerns to make sure that new catalytic converter's will not be damaged as well? https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.