w204 occasional knock from front?

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ThePickle

New Member
Joined
Aug 7, 2014
Messages
14
Car
C320CDI
My c320 makes an odd knock if I drive slowly over those mound speed bumps or a small pot hole.

It does not sound like the suspension but possibly something loose like the under tray but that seems secure. The sound is almost like flicking an empty big bottle of coke and the sound only ever happens twice per time with about half a second gap between the knocks.

What could cause this?? Are there any known reasons like exhausts moving about or trim moving?
 

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