Noticing some rattling coming from the rear tires when going over any bumps. Nothing loose visible, but when I hit either rear tire with my hand I can hear the rattle, sounding like a loose hubcap (which it does not have). Also noticed (as this is a new, used, car that I have purchased) that the steering wheel is a little (not very much) off center. Any advice as to what this could be would be helpful. Thanks.

 

The rattle is probably a heat shield that has come loose. I've never had that problem on a Volvo but each of my audis have had that issue at some point. Easy fix at a tire shop. The steering wheel issue could be due to 'damage' from hitting a curb. This happened in my RS6 after hitting a pot hole. The dealership charged my $50 to realign the dteering wheel on the shaft and all has been well since.