Hey there! As someone who frequently buys used cars, I have found Carfax to be an invaluable resource for checking a car's history and ensuring that I am getting a reliable car. With Carfax, you can get a detailed record of past car owners, accident history, maintenance records, and more. This service is very stable and rarely has problems, but if this happens, you just need to contact carfax customer service and they will certainly provide assistance.