Thanks, people think there's immediately something wrong with a car if someone sells it too quickly. They would never stop and think of any other reason a person might have for selling something. Especially something they shouldn't pry into for privacy reasons.
I don’t think it’s unreasonable to ask, as two weeks is very short! So it does beg the question if someone is getting rid of a car after only two weeks. Understand it may be personal, though if someone wanted to buy it I think it’s a fair question!