my passenger side airbag is making rattling noise when the road is bumpy, and I want to fix that...must I buy a new airbag or it can be fixed? the rattling stop when you put your hand on it....it's like it's loose and shake when the car vibrate. It's VERY annoying >>

It may just be the bolts underneath it somehow came loose.

But chances are it's not the airbag unit itself, but maybe the part of the dash where the airbag pops out of came loose from the dash itself. You could pull the airbag out(Lots of work...I just did it) and see if it still rattles. If so, I don't know what to do...you don't want to glue that piece down I don't think since it's made to burst open when the airbag deploys. So I don't really know...