Unfortunately, it appears that your state's lemon law only applies to new cars, so that will not help her. That means that only if the dealership either knowingly mispresented (or lied), or knowingly omitted to reveal a fact which any reasonable seller would have, would they likely be liable. In other words, if your sister can show that they knew--or perhaps reasonably should have known--about the problems (which may well be the case), she may be able to either rescind the sale (return car, get money back) or keep the car but get monetary compensation. Note that she'd have to sue to get this, if the dealership will not voluntarily rescind or compensate.If however the dealership truly was innocent of any knowledge that there was a problem, it will be harder to establish liability against them. And if any problem occured after driving off the lot (e.g. she hit a big pothole fast, which popped the wheel off), they are not responsible.Overall, it seems like there is at least a reasonable chance she has a case, since is likely they knew or should have known of these problems, and hence could not sell the car without disclosing them. It would be worth her while to consult with an attorney, if the dealership will not voluntarily correct matters.