We Offer Smog Testing. We Also Offer Brake and General Repairs. Proudly Serving Contra Costa County Since 1997! Currently, smog inspections are required for all vehicles except diesel powered vehicles manufactured prior to 1998 or with a Gross Vehicle Weight (GVWR) of more than 14,000 lbs, electric, natural gas powered vehicles over 14,000 lbs, hybrids, motorcycles, trailers, or gasoline powered vehicles 1975 and older. A smog check is a test done on the exhaust system of a motor vehicle to determine how many pollutants, and of which type, the vehicle is emitting. The smog check also includes an assessment of other parts of the vehicle to make sure that they are in working order, especially those parts which pertain to emissions control. We service all types of foreign and domestic vehicles and built our business on loyal expert service in Contra Costa County since 1997.