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Q:

metallic noise coming from underneath with engine running. on 2002 Mercedes-Benz C240

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Noise does not increase with engine rev'd.
(1) Answer
We would need to know what kind of noise it is and when it happens to begin to guess. My suggestion is you contact our dealership to provide us more detail. That way we can help solve this issue for you. 630-305-4560 Mercedes of Naperville.