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I've had my 2015 E400 Coupe for about 3 years, and about 2 years ago a creaking noise developed that appeared to emanate from somewhere in the steering column. The creaking noise would be noticeable whenever I went over a bump. I've lived with it in anticipation of tearing into the steering column to find the source. Today I was under the hood checking things out, and on a whim put a wrench on the strut tower bolts to see if they were tight. The bolt indicated in the photo was "loose" in that I was able to put about an eighth of a revolution turn on it until it seemed tight. Upon driving after tightening the bolt, and to my surprise and delight, the creaking noise is gone!!