A legible original or a legible copy of the invoice shall be given to the customer for repairs performed and parts installed, regardless of whether a charge(s) is levied (i.e. warranty repairs). There shall be printed on the invoice in prominent type the following statement:

“An estimate as required (Section 9844 of the California Business and Professions Code) for repairs shall be given to the customer by the service dealer in writing, and the service dealer may not charge for work done or parts supplied in excess of the estimate without prior consent of the customer. Where provided in writing, the service dealer may charge a reasonable fee for services provided in determining the nature of the malfunction in preparation of a written estimate for repair. For information contact the Bureau of Household Goods and Services, Department of Consumer Affairs, Sacramento 95834.”