https://play.google.com/store/apps/details?id=com.carfax.cvhr&hl=en - Carfax is there for you if you are buying a used car. Through Car fax, you can do a check on the VIN of the vehicle, or on its registration number. This way, carfax.com will tell you whether you are buying a problem or lemon car. Best of all, the Carfax service is completely free.