I know this has been discussed before, but I'm not getting anywhere with my dealership and would like to see what you all have found to be the best way to handle this.
My 2014 has had multiple failures (Coolant leaks starting in 2015, all new tires after 8k miles, new 12V battery, constant consult wksp warnings) and has been in the shop 3x just since Sept. The 12V battery was replaced just weeks ago, and now we got the dreaded "without starting engine again" and had the car towed just 100 miles after they put the new battery in. Thank goodness by husband was alone in the car and near the house. The car was driving fine, but has a miserable "whine" to the engine which is just getting worse and worse. I noticed in the dash photo that the E-CELL display went from full to 1/4 in a single day, so at this point I am convinced it is the drive unit. Car has ~42K miles on it and hit 4 years in October. So technically over years but under on the 50K miles.
Dealership is relatively unresponsive and have no clue how to handle a B-Class. In fact, in living in NJ/PA since I bought it I've never seen another one! I was told they are opening a "Technical Case" with Mercedes, and only after I pressed them did they admit that the issue was very likely the Drive Unit. Since this issue seems to be very common on this board, can anyone suggest a plan of action or list of questions that had worked for them? The said the 12V battery was out of warranty but they paid for the replacement "to be nice" (I don't buy that). I'm thinking how far up to press the issue, the known link to failures with Tesla/Rav-4's, etc. At this point I know that I know more about the car than the dealership and that's not comforting at all.
I love the car, but it's limited range compared to new EV's and the 7th servicing in 4 years has me really depressed about the entire thing!