The front of my car has been making a pong sound. If I drive over a bumpy road, it becomes more noticeable. I went to the dealer and he said it was caused by the front differential. After he had it replaced, the sound could still be heard. I had the bearing on the front left wheel replaced but the sound is still there. I replaced the wheels and tires replaced as well with new BMW 5-series ones. This didn't solve the problem either. Do you have any suggestions what else I might do?
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