I had the check engine light come on my 2010 C300 4matic Sport and connected my OBD reader and it will not power up. Confirmed my code reader was working (hooked up to another car) and confirmed there was a fuse in and was not bad in the trunk fuse panel. OBD Code Reader still will not power on when plugged in.

Any other suggestions?

Thanks in advance

 

Sorry, I can't help you. Go to the repair shop and have a look