My catalytic converter makes noises like marbles Rattling in a can, I am taking it to a dealer but the engine light is not on so they’re gonna tell me there’s nothing wrong but I hear it every morning is there something I can do to fix this issue or just go buy a replacement and do it myself thanks

2018 Chevy Silverado 1500 high country (48000 miles) 2k shy of warranty go figure “Murphy’s Law”

if I go this way and do it myself any recommendations as I do not know what I’m doing never tackled a catalytic converter issue in my life but I’ve seen videos it doesn’t seem hard and I’m not afraid to tackle it

thanks to everyone that comments
Bill