CARFAX provides a thorough report on the vehicle's history from many official sources. You'll know when and where the vehicle was serviced, whether any damage has been reported, how many previous owners the car has had, and many more factors that help build a complete picture of car condition and quality. CARFAX can be thought of as your guardian angel while used-car shopping With one-owner CARFAX vehicles, you can also be sure that the vehicle was cared for by one owner and one owner alone. They most likely kept it in excellent condition, and you'll reap the rewards.