{"data":{"id":"us/40-cfr-86.104","jurisdiction":"us","citation":"40 CFR 86.104","heading":"Section numbering; construction.","body":"(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 A section remains effective until superseded.\nExample.\nSection 86.111-78 applies to the 1978 and subsequent model years until superseded. If a § 86.111-81 is promulgated it would take effect beginning with the 1981 model year; § 86.111-78 would apply to model years 1978 through 1980.\n(b) A section reference without a model year suffix refers to the section applicable for the appropriate model year.\n(c) Unless indicated otherwise, all provisions in this subpart apply to petroleum-fueled, natural gas-fueled, liquefied petroleum gas-fueled and methanol-fueled vehicles.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 86—CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND ENGINES","Subpart B—Emission Regulations for 1977 and Later Model Year New Light-Duty Vehicles and New Light-Duty Trucks and New Otto-Cycle Complete Heavy-Duty Vehicles; Test Procedures"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"80509f1472e22f63f46abc4b7db04629654ce2a7d0949e7a3afb268181623d74","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-86.103","next":"us/40-cfr-86.105"},"notice":"GroundRules: Original legal text. Not legal advice."}