Carfax And Your Used Car Purchase - In this economically-challenged times, buying a used makes more sense but you can only make the most out of this if you know how to use used car buying tools such as Carfax. Car fax, which is accessible through can provide you with the history of the vehicle you would like to buy. Use Carfax information to help you determine whether the car is bound to last long without giving you much headache.