At first I thought It was my passenger side skirt but its tight. Its comming from around the passenger side over the rear tire.

any idea what this could be?

 

One of the car tools or the jack sits near the passenger side rear. That would be my best guess. Do you hear it the same when the windows are up and down? Maybe check and see if the wheel well is tight. I'm not really sure.

 

I had a annoying rattle before. Found out the rear brake caliper had to be replaced because it was loose. So get it checked out at the dealer. Of course it was under warranty.

 

Man, I've got the SAME rattle (coming from the rear passenger side). It's so friggin annoying on long freeway drives, and I've had little luck trying to locate and fix it.

It comes and it goes though...I haven't heard it in about a week, but I'm sure it will be back.