40 CFR § 86.104 - Section numbering; construction.
---
identifier: "/us/cfr/t40/s86.104"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 86.104 - Section numbering; construction."
title_number: 40
title_name: "Protection of Environment"
section_number: "86.104"
section_name: "Section numbering; construction."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "86"
part_name: "CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND ENGINES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401-7671q."
cfr_part: "86"
---
# 86.104 Section numbering; construction.
(a) The model year of initial applicability is indicated by the section number. The two digits following the hyphen designate the first model year for which a section is effective. A section remains effective until superseded.
(b) A section reference without a model year suffix refers to the section applicable for the appropriate model year.
(c) Unless indicated otherwise, all provisions in this subpart apply to petroleum-fueled, natural gas-fueled, liquefied petroleum gas-fueled and methanol-fueled vehicles.
[42 FR 32954, June 28, 1977. Redesignated at 45 FR 14508, Mar. 5, 1980, as amended at 54 FR 14499, Apr. 11, 1989; 59 FR 48504, Sept. 21, 1994]