I'm not sure what you mean by "have carfax/autocheck". Typically, you purchase either one for a vehicle that you are serious about purchasing. The dealer that we bought our last used vehicle at provided a carfax that showed how many previous owners, reported accidents, dealer maintenance, etc. I believe you can run one on a vehicle that you currently own; however, I don't know why you would want to--if only to learn about the previous history of the vehicle. Hope this helps...