This is my first post on the forum after many months of reading, including picking up some really good insights and advice.
I'd like to share my experience with my 2022 M40d, made in US, delivered in January 22, now with 30k km (19k miles) on the clock.
This is my first BMW, after many years of VAG cars (VW, Audi), followed by Mercedes GLC after which I switched to BMW. I have no intention of opening a debate about which brand is better as I strongly believe in that the German brands are all close to each other and that issues more or less have to do with bad (or good) individual luck. I also think that many of the issues that you will see below may not even be registered by some owners. However, cars are a bit more than A to B to me. So here goes:
- From day 1 I noted a high frequency steering wheel vibration, present only in a narrow speed band, from 120 to 130 km/h (that would be 75 to 81 mph). The issue was reported to the BMW dealership but was not taken seriously.
- The central display (MMI) developed an issue after 6 months, a strange shift of pixels in the bottom right corner, especially when the car was cold. BMW replaced it with a new one (24 hours), no questions asked.
- The steering wheel developed a strange resistance in the dead center position followed by almost no resistance in the +/- 5 degree position. This was one year into the ownership (15k kilometers on the odo). The entire steering rack was replaced, no questions asked, problem solved.
- The plastic 'fake' front wheel wing exhausts faded to become muddy purple instead of original glossy black. BMW replaced the parts after some back and forth with them. Still OK as far as their approach in the end.
- The windscreen washer bottle developed a rattle which I identified THANKS to this forum. A piece of plumbing insulation foam did the job. Nevertheless, almost two months of searching for the culprit was taxing on the nerves. Never reported to BMW, though.
- A strange sound, similar to plastic parts crushing, developed in the front suspension, especially when the car was cold and outside temperature approaching the freezing point. This was noticeable only when the shock absorbers were approaching full compression, regardless of the rate of compression. BMW insisted that this was intended behavior, perfectly normal or not reproduceable (depending on whom I spoke to in the dealership).
- At the first service (2 years or 30k km) I insisted that the aforementioned vibration needed to be looked at. My suspicion from the beginning was the main/rear drive shaft out of balance. Alas, my input was irrelevant to the dealership. This is where the real annoying part of the story starts. The car was taken in for regular service which was extended to a full week. The car was returned to me as I needed it back for a vacation trip. New appointment in 2 months' time... fine. I took it back mid-January this year, for what will take almost 5 weeks to fix.
They finally admitted that the vibration was not normal and had to be resolved. The approach they took is still fascinating to me, although I truly appreciate how this could be hard from the diagnostics perspective. First, they replaced all wheels with their own (BTW, I do not have BMW * marked tires and if that myth was true, I am sure they would have failed my warranty claim immediately). It was not the wheels (I did tell them I have two separate sets, winter/summer, both perfectly balanced... but no...). Next was thorough cleaning of wheel hubs, brakes, etc., to no avail. Third, they replaced all 4 wheel bearings. Nothing. Fifth, they removed the front half-shafts and disconnected the front transfer box. To no avail. Sixth, they removed the rear half shafts rendering the car FWD only - same behavior. In the end it boiled down to either the rear differential or the rear/main drive shaft. Finally, they replaced the driveshaft, and the problem is GONE. They also told me that some bolts on the front shock absorbers were 'not tightened to spec in the factory' and that this was the reason for the noise described in one of the above items. This is yet to be confirmed, if the issue is really gone.
Honestly, I am not sure what to think. The car is a dream to drive, to me personally miles ahead of my GLC or the Tiguan before that. I did have issues (in warranty) with those cars too, but nothing close to this. Although we do not have the lemon law in EU (and therefore no 'lemon' adjective), I do not want to call it a 'lemon' or a 'Monday' car, but that would not apply as the car was built in Spartanburg
I just wanted to share my experience with the community, maybe helping others with similar issues pinpoint the issue. Perhaps also provoke some comments too!