MERCEDES BENZ ENGINE WILL NOT SHUT OFF

My Car Shut Off On Me In A Drive Through And Would Not Start Back Up. I Couldn't Even Turn The Key In The Ignition At All. Checked All...

Having Changed The Battery, I Cannot Extinguish The Yellow Engine Warning Symbol.

So After Idling Irresponsibly For About 45 Minutes To An Hour With The Very Little To Almost No Gas, My Car Rough Idle And Then Completely...