I have BMW 116i 2009 model. Since last 1 week or so, i start hearing this strange 'trrrrrr' sound while accelerating.
I googled this problem and foundout that the same problem is experienced by a few other people as well. But so far, i havent been able to find any reason/solution for this sound.
Just to demonstrate, please listen/watch these 2 youtube links that I found showing exactly the same problem.
Just to clarify again, the car showed in the above links is different from the one I have (116i – 2009).
I think one can only hear this sound while sitting inside and driving the car.
Could someone help me out on this?