Transfer, Replace, or Change Title To prove vehicle ownership, it's important to have a valid, up-to-date, and accurate Certificate of Title. According to the DMV, yes you can, however the previous owner must sign the necessary forms in order for them to be valid.This document helps the buyer when they apply for a new title. You can use the CA DMV form REG135 for a bill of sale. 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. A California motor vehicle bill of sale is part of the vehicle registration process. Use a free template to write your own bill of sale. We will be addressing how to fill out a bill of sale form for the sale of a car so let's get started with this guide to filling out a bill of sale form. Only one owner must sign if title states "OR" between owner names printed on the front of the title.