Hey Steve and C32AMG!

Thanks for your quick and detailed response, I really appreciate your input. Yeah, initially wanted to dispute the CarMax tech and disagree with his diagnosis. But I just casually stated that another tech read the codes to mean a faulty air mass sensor. But then I figured that I'll end up getting a new fuel pressure regulator out of the deal. I really wanted a Mercedes shop to make the repairs, but MaxCare warrantee makes it so difficult for a thirdparty to make a claim. I have learned a valueable, albeit, expensive lesson in car buying. The next time, I'll buy from a Mercedes dealership. Again, thanks for you insight and advice. -Norm