Transfer, Replace, or Change Title To prove vehicle ownership, it's important to have a valid, up-to-date, and accurate Certificate of Title. You will need the reg 227 if no title is available.The registered owner (her) will need to fill out sections 1,3 and 4. You ask the California DMV. Things like titles and bills of sale are normally required to prove legal ownership. To sell a car legally, you need a clear title, Bill of Sale, lien release statement (if applicable), and an odometer disclosure form. If you do not have the title, complete an Application for Replacement or Transfer of Title (REG 227). To sell your used car without a title in San Diego, you'll need another way to prove ownership. As long as your registration is up to date. Selling your car car in California might seem overwhelming.