I have a w177 220 4matic, from 2018.
1. The most pressing issue with the car is this very loud sound (metal), usually when the car is starting to get hot, and it comes from somewhere under, closer to the exhaust:
2. The other rattle (plastic) is inside the car, usually at high...
Got the car in November 2018. Just three years later this is what the start/stop button looks like (attachment).
Not a big deal and it's purely an aesthetic problem, but this doesn't exactly scream "luxury vehicle".
I found the part number (A 177 905 10 01) at a cost of US$28 (about £21.14)...