02 C320 Engine Rattle????? Emissions warranty?

[Scrubs]

Hello All,

I’ve done a lot of searches on this problem but wondered if someone has had the same problem or knows what it could be. I’m getting a rattle noise coming from underneath the car from the back of the engine. You can hear the rattle when revving engine at low RPMs (mainly on deceleration). My wife drove the car today and it stalled on her and the check engine light came on. She was able to get it home (only 3 miles away) and now I’m trying to figure it out before I take it in.

I’ve read about the catalytic converter but this seems to be between the cat and the engine. The engine seems to run fine and it sounds like its coming from the emissions system. The car only has 58k miles on it. I’ve read about the emissions warranty lasting for 80,000 is this true? My standard warranty ended at 50,000.

Any help would be GREATLY appreciated!!