Hi, I own a GLA 45 AMG, it has a sound like a knock on a door on the rear part of the car, this occurs when I am stopped trying to park and I turn the wheels completely to one side and go Reverse and it will sound again if I turn the wheels completely to the other side and go Drive. It is just one knock and is on the rear part of the car.
I took my car to Mercedes Service and they changed: car differential 2 times, rear shafts, calipers, wheel hub, absorbers, cardan, exhaust and the sound still remains. Please some help if someone had this problem before. Now I am thinking on removing everything from the cockpit to find if something is loose (seats, covers).