There is no free CARFAX account available to you if you are interested in a pre-owned vehicle. The dealership may hand you a brand new CARFAX report on the vehicle in which you are interested. This is especially true if they are part of a certified, pre-owned vehicle program where each vehicle must be provided with a CARFAX report. However, given the price of an individual account for a dealership, it is highly unlikely you’ll be getting your own account. Unless you are the manager of a dealership, you’ll just have to wait for the dealer to hand you the report on the car you’re thinking of buying.
For more info, see How to Find Out if Your Car has a Factory Warranty