Cal. Rev. & Tax. Code § 11105

A vehicle license fee ordinance adopted pursuant to this part may be repealed by action of the board of supervisors of the county. A repeal of any vehicle license fee ordinance adopted pursuant to this part shall not be effective for any calendar year unless the board of supervisors takes action to repeal the ordinance at least four months prior to the first day of January the year for which it is to be repealed.