Need some help !

Can someone tell me where the EGR valve is located and what's needed to remove and replace it?

I looked at the engine and see 2 devices that look like EGR valves on the front of the engine - but I don't think these are EGR valves.

EGR is on the other (rear) end of the engine relatively to these 2 'mushrooms' you are talking about, looks similar though - you will easily find it

Clogged EGR Passages on ML 320