S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

Noise underneath my baby!!!

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Old 10-15-2010, 02:13 PM
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2001 S500 and 2000 BMW 740I
Noise underneath my baby!!!

Hi fellow W220 owners,

This morning as my wife went to warm up the car I heard the most disturbing noise from my 2001 S500. It sounded like a rattling noise and with no idea where it's coming from I decided to explore. With minimal experience in noise recognition I was at a lost. I also notice this noise whenever we com to a stop and then take off at low acceleration.

Does anyone have a clue as to what/where/why/how this came to be and any sugestion how to eliminate this? Any suggestion is greately appreciated and thanks in advance..
Old 10-15-2010, 02:36 PM
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2000 S430 140k (07/11)
Could be number of things, here are some simple stuff you can check for:
Make sure your belt is still on.
Turn ac off and see if there is a difference.

Check the link below and read sections about motor mounts, cats and harmonic balancer.
https://mbworld.org/forums/s-class-w...tart-here.html
Old 10-15-2010, 03:22 PM
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2005 S500 4-Matic, 1978 450SL
It could also be your catalytic converters starting to go bad - especially if it sounds like it's under the front driver and passenger seats.
Old 10-15-2010, 03:31 PM
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2001 Mercedes S500
Secondary cats. I could almost bet money on it. Mine did the same. It was a metallic rattle at idle/low revs. sounded like a ball bearing in a tin jug.

I just had the secondary cats removed and a straight pipe installed in place of them. Car runs completly fine and sounds no different, well other than the rattle is gone.
Old 10-15-2010, 04:35 PM
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2003 S430
Originally Posted by shellshock
Secondary cats. I could almost bet money on it. Mine did the same. It was a metallic rattle at idle/low revs. sounded like a ball bearing in a tin jug.

I just had the secondary cats removed and a straight pipe installed in place of them. Car runs completly fine and sounds no different, well other than the rattle is gone.
and no error message ?
Old 10-28-2010, 08:35 PM
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S500
I bought the OEM reman part from my local MB dealer for $576. Other dealers were quoting $1000+ for the part because they didn't know about the the reman part being available. It was OEM Mercedes and bolted right on. I had my indy shop install it for $90.

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