What are symptoms of a clogged catalytic converter?

Symptoms of a clogged catalytic converter include decreased engine performance, such as reduced acceleration and power, as well as a noticeable decrease in fuel efficiency. Drivers may also experience unusual engine noises, such as a rattling sound, and the check engine light may illuminate. Additionally, there may be excessive exhaust emissions and a strong odor of sulfur or rotten eggs. If these symptoms occur, it's essential to have the vehicle inspected promptly.