What to do when purchasing a car from a private party.
If you have purchased a vehicle registered in California, you will need to transfer the ownership within 10 days from the date of purchase. You will need to do and/or have the following:
Visit a DMV office. Make an appointment for faster service.
A properly endorsed title, also known as a pink slip, with the previous owner's signature on line one. If the vehicle is or was financed, line two of the title will also require a releasing signature. If the title is lost, an Application for Duplicate Title (REG 227) must be completed and signed. There is an additional fee for a duplicate title, and signatures of the legal owner and lienholder must be notarized. If the vehicle was not purchased from the owner whose name appears on the title, you will need a bill of sale from each in-between buyer.
The odometer mileage is required if the vehicle is less than 10 years old.
If the title does not have a designated space for this information, the odometer mileage disclosure must be reported on a Vehicle/ Vessel Transfer and Reassignment Form (REG 262) signed by both the seller and the buyer. The REG 262 cannot be copied. An original must be submitted. To obtain a form by mail, call DMV's automated phone service 24 hours a day, 7 days a week at 1-800-777-0133. To speak to an operator call between the hours of 8 a.m. and 5 p.m. Monday - Friday, Pacific Standard Time, or pick one up from your local DMV.
A smog certification.
Smog certifications are good for 90 days from the date of the inspection. The smog certification is not required if a biennial certification was submitted to DMV in conjunction with renewal fees within 90 days prior to the vehicle transfer date. A statement to that effect must be signed by the seller or the buyer. A vehicle inspection report may be required for proof of certification.
Recent legislation changed the requirements for vehicle transfers occurring on or after January 1, 2005. When you transfer a vehicle that is four or less model years old a smog certification will not be required. A smog transfer fee will be collected from the new owner. When a vehicle is more than four model years old, evidence of a current smog certification must be provided by a seller except when the following occurs:
The transfer occurs between a spouse, sibling, child, parent, grandparent, or grandchild.
A biennial smog certification was submitted to DMV within 90 days prior to the vehicle transfer date (a vehicle inspection report may be required for proof of certification).
Pay the transfer fee.
Pay the use tax, if applicable.
Use tax is calculated based on the sales tax rate in your residence county.
http://www.dmv.ca.gov/vr/vr_info.htm#BM2522