Find out who holds the title for the car. This information can be found on the car's title or registration.
File a Notice of Intent to Lien. This document states that you are intending to place a lien on the car. The specific requirements for this document vary by state, so you will need to research what is required in your state.
Serve a copy of the Notice of Intent to Lien to all interested parties. This includes the owner of the car, any lienholders, and the Department of Motor Vehicles (DMV).
File the lien with the DMV. This will create a public record of the lien, which will prevent the owner from selling or transferring the car without your permission.
The process for placing a lien on a car can be complex, and the laws vary by state. If you are unsure how to proceed, it is best to consult with an attorney.