Cal. Civ. Proc. Code § 700.090

If a vehicle or vessel is levied upon and a certificate of ownership has been issued by the Department of Motor Vehicles for such vehicle or vessel and the certificate of ownership is still in effect, or if a manufactured home, mobilehome, or commercial coach is levied upon and a permanent title record has been established by the Department of Housing and Community Development for such manufactured home, mobilehome, or commercial coach the levying officer shall determine from the appropriate department the name and address of the legal owner and each junior lienholder of the property levied upon. If the legal owner or junior lienholder is not the judgment debtor and is not in possession of the vehicle, vessel, manufactured home, mobilehome, or commercial coach, the levying officer shall at the time of levy or promptly thereafter serve a copy of the writ of execution and a notice of levy on the legal owner or junior lienholder. Service shall be made personally or by mail.