I'm from Europe, but i've lived in the US for 3 years +. My experience of the US laws is that whenever there's a litigation, both parties better be clear of any wrong doing. Even if the wrong doing is not directly related to the accident or problem.
As an example, a friend of mine had a problem with a contractor. The job was really not done properly but the contractor wanted to get paid.
The contractor hired a lawyer. However, my friend noticed that on the paperwork used by the contracting company, the address and contact information was not specified or was outdated. I don't know the details, but that's illegal. A company has to specify on agreement or quotations their correct contact information.
Even if this was really not related to the problem itself (did the contractor deserved to get paid?), the contractor eventually backed off.
I think it doesn't make sense, but it seems that whenever you're in a litigation in the US, you better be cleared of any wrong doing, so I would say you have good chances to get away with it.
If the dealer gave a car to a 17-year old, I believe it's more their fault than your own fault.
Again, talk to a lawyer
and good luck
One more thing: money is just money. If you eventually have to pay, it might empty your wallet, but your wallet is really not the most precious thing you have in the world. Even if it might look like it right now.