rondocap

I've done some research on the forum, and I know it is hard to pinpoint a problem without hearing it, but this is what I am experiencing:

When I start the car up, there will be a very small vibration on the driver's side. From inside it almost sounds like the dash is vibrating. It may be coming from somewhere near the left side of the car, closer to the engine area or below the car.

When I am near a wall driving, I can hear a rattling type noise, almost if there was snow in my wheel well, but it's clean. I have a little tear on my tire, could that be it, or perhaps this is connected with the vibrating I hear when idle?

Through my research, I see that it may be possibly a failing catalytic converter. It only vibrates at certain times though, and not always. Are these symptoms indicative of this? I have 118k miles, too S55 AMG.

Gondon

A rattle from that area usually indicates its the CC.

rondocap

Is the only solution to change the catalytic converter? I think the part is like $1200 for one side isn't it?

fkong777

use a pipe or wrench. Knock on the exhaust pipe near the rattling. if it rattles it is the Cat.

lttk913

Do a search for the Federal Clean Air Act. Your vehicle may be covered by a Warrenty. I had the same noise on my 2003S430 and Mercedes replaced the CC free of charge.

rondocap

I figured out what was causing the rattle and vibration! It wasn't the catalytic converter, but listen to this:

I opened up the hood and tried to see where the noise was coming from. It was coming from my ABC pump reservoir area. I looked closely, and it was loose - there was a bolt missing from the part which connects it down and keeps it stable. That was causing the metal pipe to vibrate and make that sound.

I just replaced the little bolt and tightened it, and it stopped vibrating as it was now held down. A pretty easy and cheap fix!