Vehicle code section 4000.1 is the California law which requires smog
inspection for California vehicles, and Section 3340.45 Title 16 of the
California Code of Regulations is the instruction on the smog check
procedure including the administration of OBD II Functional Test. The OBD II
functional test includes access to your vehicle's computer system for the
purposes of gaining trouble code and readiness monitor data.
posted by SmogTips Support