Hey Guys my Mercedes C240 makes a strange ticking noise. Its a part located near the ABS pump under the hood of my car. Its a black part. The ticking noise is very noticeable when the car is idling or being driven at lower speeds. On the freeway I don't notice it as much, perhaps road noise drains out the sound. Does anyone know what my problem could be or what that part is?

Thanks

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My Cars
Mercedes CLS
Mercedes C-Class W203 - All time favorite

R.I.P.
Mercedes C-Class - W202 Lemon
Mercedes ML - Warrior
VW Jetta – Worst Car I ever owned - Alot of problems