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Plastic rivet, used to hold other plastic pieces to the underside of the car. Probably in this case it's holding on a plastic splash/aero shield, which is what bent. No big deal.

Damn things fall off all the time. Go look under yours, I bet you're missing a few. And you haven't crushed any alternators in the process.

I was actually pretty disappointed to see that--because I hate those things. I guess it was too much to believe that Tesla wouldn't have any of those damned plastic clips. I guess once I get my (rather unlikely) Model S I'll still have a reason to go to AutoZone.

As posted elsewhere it is a plastic snap fastener. Likely a secondary attachment for fit and vibration. No way is it structural or it's absence compromise the structural integrity. Do you honestly think they might have overlooked it if it was critical?

If my car went over a concrete block with nothing more than a dent in the underside I'd be very happy.