You might be able to seek relief through state agencies:

Guide to Automobile Service Contracts, Extended Warranties and Other Repair Agreements

Contact regarding complaints concerning poor quality auto repairs

Bureau of Automotive Repair

10949 North Mather Blvd.Rancho Cordova, CA 95670

Toll free: (866) 799-3811

Web site: www.autorepair.ca.gov

Contact Arbitration Certification Program regarding Lemon Law information     

Department of Consumer Affairs

1625 N. Market Blvd., Suite N-112Sacramento, CA 95834

Direct Office: (916) 574-7350

Toll free: (800) 952-5210

Web site: www.lemonlaw.ca.gov

Contact manufacturer new car warranties and Lemon Law information

New Motor Vehicle Board

1507 21st Street, Suite 330

Sacramento, CA 95814

Phone: (916) 445-1888

Web site: www.nmvb.ca.gov