Battery was going dead after sitting for a few days, I found the negative terminal totally loose (floating around) Ironically, the dealer was the last one to work on it when they replaced the center camshaft. I charged the battery and car worked fine except the radio didn't work- the mercedes logo comes on & then disappears. The dealer says they want $2600 to fix this issue but cannot guaranty I don't have other thing drawing down the battery.
Has never worked from day 1, dealer is lost and can not fix it and charges me for inspection every time, claims this is not covered by warranty.
Just a lousy car
Mercedes dealer told me I needed a gateway (receiver) for about $900.00 or maybe more. They weren't sure. I brought to a local repair shop with computers and they fixed in half hour. They put in a master fuse and recalculated the computer. Total $75.00. Now I have back my radio and all functions again. Screw Mercedes. Next car a Ford.