2001 s320 noises from underneath the car looks as if the car joints or airmatic suspension give this rattling sound which is very annoying . The airmatic system was replaced to Arnott 5 years ago
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You may want to give us more information, for example I doubt it has anything to do with Arnott parts on your car, AFAIK they do not make / refurbish parts with Ball Joints or Bushes, they tend to do Air Struts, Valve Blocks and Compressors.
If you are saying that Ball Joints or Bushes have play, then those components, like lower Arms need replaced with good quality items, Lemforder, Febi Bilstein or MB would be considered good
El cheapo parts are usually Chinesium rubbish, First Line f.e. so don't waste your money they don't last
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