Help needed to identify part on Clk w209

[Telsin]

Hi all

Could any one held identify the below part, pictured below its ticking like crazy and driving me mad therefore I want to replace.

Its placed passenger front side behind from head light unit, I think the lines connecting to the part are labelled MOT ?

thanks all

 

[BlackC55]

It is supposed to tick and is normal.

 

[x332race]

When does ticking occur and what does it sound like?

 

[mattkh]

....its ticking like crazy

Hi
Does it tick when idling with a cold engine ?