Check engine light blinking. Car shaking hard. HELP. PLEASE!!!
 

I recently purchased an 09 mb C 300 it had 82000 miles on it... So far everything jas been working fine. Today I drove about and hour to drop off a friend and sat parked in my car for about 25 mins with the A.c. running. When I went to put my car in reverse I noticed it started shaking a little and my check came on and started blinking so I placed it back in drive moved the car back fwd turned the A.c. off ( it shook a little less but still violently) and turned it off...I sat there for another 10 mins and tried starting it again and it was still shaking but this time when I turned the A.C. on and hears a very LOUD sound... What could be going on? Any advice?

There could be quite a variety of issues. I would start by getting the codes read off the DTC, this will give you a great place to start troubleshooting. I'm also attaching a link to our site's DIY tech articles on the W204 platform in case you're going to be working on the car yourself. Please let us know if you have any questions and best of luck!

Mercedes-Benz W204 C-Class Technical Articles (2007 - 2014) - Pelican Parts