CA AB646

Expands the definition of "vehicle protection product" under California insurance law to include physical devices, systems, or services designed to prevent unauthorized removal of a vehicle's catalytic converter

Limits warranty benefits for catalytic converter protection products to the actual cash value and replacement cost of the catalytic converter, temporary vehicle rental expenses, and reimbursement for insurance policy deductibles

Requires sellers of catalytic converter marking products to provide a written disclosure informing consumers they are not required to purchase such products, that Vehicle Code Section 24020 already mandates dealers mark catalytic converters, and that existing auto insurance may cover catalytic converter theft

Specifies that warranty benefits for catalytic converter protection products become payable upon theft of the catalytic converter from the vehicle, subject to proof-of-claim requirements