Section 85.2101 - [Effective 6/17/2024] General applicability(a) Sections 85.2101 through 85.2111 are applicable to all 1981 and later model year vehicles subject to standards under 40 CFR part 86, subpart S.(b) References in this subpart to engine families and emission control systems shall be deemed to apply to durability groups and test groups as applicable.