Malfunction light on dash / implausible connection

What is your question?

My GL450 was riding low so I had it serviced and they replaced the front right strut. The malfunction light is on every time I drive the car but the service tech finds nothing wrong with this. Now my car is making a horrible noise when I start it first thing in the am. The loud noise lasts for about 50 seconds and then the malfunction light comes on. Another shop said there is an implausible connection on the computer. Is it a bad strut that was installed? Any help would be greatly appreciated!

What makes this problem better or worse?

When it's started first thing in the am.

How long has your 2012 Mercedes-Benz GL450 had this problem?

several weeks