Calif's original 1996 OBD II regulation required OBD on all cars with a GVWR of <14,000 lbs. EPA's original 1996 OBD regulation only required OBD on cars with a GVWR of < 8,500 lbs. So, for cars certified Federally that were between 8,500 and 14,000 GVWR, they... Login to read more.