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

Noise does not increase with engine rev'd.

Asked by for the 2002 Mercedes-Benz C240
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.