My 320d is also exhibiting some knocking sound on front right side when going over bumps. It seems to be getting a bit more obvious since the day I received the car. My car is only at 1400km now.
Is this the steering rack issue or the absorber problem? The sound I hear is very similar to absorber problems that I encounter with 2 other cars I drove before.
Worse now, after I sent my car to rectify the rusty seat problem. It seems that I'm hearing some really weird sound going over bumps. Its very soft and not audible in the mornings with too many cars around.
At night when driving over bumps or uneven roads, I hear some sound similar to bird chirping very softly. I couldn't rectify whether its coming from the seats or outside. But it's definitely from the right side of the car.
I'm not sure if this sound is coming from the seat not being tighten properly to the chassis.
I've tried getting out of the car with engine turned off and try shaking my car violently. No unusual sound from the absorber or whatsoever.
Then I tried to bump my driver seat up and down and no sound too.
Anyone had this issue? I've got a feeling my issue is quite isolated.
Thanks!