What’s the most common problems with 2009 C209 series, CLK 350 coupés? Cars I’m looking at averaging 60-80,000 Florida driven miles. So no snow use, rust, etc. I believe these come with the E35 version M272 3.5 L V-6 engine. Being new to Merc’s, where do I locate the “codes”? And how do I pull them? Where can I find instructions on how to pull and read codes? Do I need a code reader tool ?