New 1998 through 2000 model-year passenger cars, light-duty trucks, and medium-duty vehicles, subject to certification and manufactured for sale in California, except for zero-emission vehicles and medium-duty vehicles certified according to the optional standards and test procedures of section 1956.8, Title 13, California Code of Regulations, shall be tested in accordance with the “California Assembly-Line Test Procedures for 1998 Through 2000 Model-Year Passenger Cars, Light-Duty Trucks and Medium-Duty Vehicles,” adopted June 24, 1996, as last amended August 5, 1999, which is incorporated herein by reference. New 2001 and subsequent model-year passenger cars, light-duty trucks, and medium-duty vehicles, subject to certification and manufactured for sale in California, except for zero-emission vehicles and medium-duty vehicles certified according to the optional standards and test procedures of Section 1956.8, Title 13, California Code of Regulations, shall be tested in accordance with the “California Assembly-Line Test Procedures for 2001 and Subsequent Model-Year Passenger Cars, Light-Duty Trucks and Medium-Duty Vehicles.” adopted August 5, 1999, which is incorporated herein by reference. These test procedures shall also apply to federally certified light-duty motor vehicles, except as provided in “Guidelines for Certification of 1983 Through 2002 Model-Year Federally Certified Light-Duty Motor Vehicles for sale in California,” adopted July 20, 1982, as last amended July 30, 2002, and the “Guidelines for Certification of 2003 and Subsequent Model-Year Federally Certified Light-Duty Motor Vehicles for sale in California,” adopted July 30, 2002, which are incorporated herein by reference.