I have a late '15 X5M with only 1500mi on my vehicle and since new, the car has been making this popping noise coming from the passenger side of the vehicle.
I took delivery of the car in March 2016 and it made this popping sound with 40 miles on the car. Then a few weeks later, it disappeared and didn't come back until recently. I've had my dealer look at it, but they are puzzled and can't figure out where it is coming from or what's causing it. My dealer has been excellent and are committed to finding a solution, but I wanted to see if anyone else has experienced this.
Here is a video I took. At first I thought maybe its coming from the passenger side mirror getting stuck when dipping down in reverse, but I put it back it drive and its still popping. The car is stationary and not moving, but it will still make the sound when the car is in motion.
Have a look and let me know what you guys think...