Make sure they have a clear title.
There should be no liens on.
If the seller is one person, make sure the title doesn’t have the word, “AND” between names if there is a co-owner.
Take a mechanic to inspect the vehicle.
See if you can secure a second vehicle key.
Do a VIN check (usually 17 digits).
The vehicle may be salvaged, and if it is, the most current title should indicate as much. If it’s because of water, be extra cautious that you’re not buying junk.
Put YOUR eyes on both the title and vehicle before purchasing.
Get a photocopy of sellers ID.
Check your state for lemon laws especially concerning right of rescension. For instance, if you have three days, know that afterwards, if the car breaks in half, both half’s are yours.
Do not buy the car if the name on THE FRONT OF the title doesn’t match the ID. If there’s writing on the back, do the transaction at your local DMV.
If you inspect the car to your satisfaction, you can hand over the certified funds (that you can get from a local bank) when you can personally see your name on THE FRONT of the title. I didn’t say money order, btw. It’s a cashiers check, or certified check, drawn off a bank.
If BULLSHIT rears it’s head, whatever guise it might fall under, WALK AWAY, if it’s starts getting past your ankles.