In California there is no legal requirement for probate if the value of the estate is less than $100,000. The following links contain information about the transfer of small estates without probate:

Affidavit and instructions for the transfer of small estates without probate

DMV Instructions and forms:

Instructions for the transfer of a motor vehicle without probate

Affidavit for Transfer Without Probate California Titled Vehicle  (REG 5)

Statement of Facts (REG 256)