2010 Mercedes-Benz GLK350 Q&A
2010 Mercedes-Benz GLK350 Question: HOW DO I RESET THE SERVICE INDICATOR LIGHT ON MY 2010 GLK?
I think you need a MBZ special tool, not sure. Find a MBZ specialist and ask him about it or look in the owner's manual. If you want to find a specialist, here's a directory link for you: https://repairpal.com/directory?address=31904&car_brand_names=Mercedes-Benz - Superbob