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Q:

warning message stating gas cap not on w/ check engine light on 2007 Mercedes-Benz R350

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A warning for loose gas cap came on 2 different times. after the second time check engine light came on. Was wondering what might be the problem.
(1) Answer
Were you getting gas with the engine running when the light came on? If so, that will trigger the gas cap warning and could possibly set a check engine light. Other wise the gas cap could just be bad and not sealing properly. Your Mercedes-Benz dealership will be able to check your code/codes for you, diagnose the problem, and repair it. Here is a link to help you find the closest service center: http://repairpal.com/directory.