{"data":{"id":"us/40-cfr-86.1802-01","jurisdiction":"us","citation":"40 CFR 86.1802-01","heading":"-01 Section numbering; construction.","body":"(a) Section numbering. 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 applicable. The section continues to apply to subsequent model years unless a later model year section is adopted. Example: Section 86.18xx-10 applies to model year 2010 and later vehicles. If a § 86.18xx-17 is promulgated, it would apply beginning with the 2017 model year; § 86.18xx-10 would apply only to model years 2010 through 2016, except as specified in § 86.18xx-17.\n(b) A section reference without a model year suffix refers to the section applicable for the appropriate model year.\n(c) If a regulation in this subpart references a section that has been superseded or no longer exists, this should be understood as a reference to the same section for the appropriate model year. For example, if a regulation in this subpart refers to § 86.1845-01, it should be taken as a reference to § 86.1845-04 or any later version of § 86.1845 that applies for the appropriate model year. However, this does not apply if the reference to a superseded section specifically states that the older provision applies instead of any updated provisions from the section in effect for the current model year; this occurs most often as part of the transition to new emission standards.","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 S—General Compliance Provisions for Control of Air Pollution From New and In-Use Light-Duty Vehicles, Light-Duty Trucks, and Heavy-Duty Vehicles"],"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":"ef6d9e2ac32eb20087c07208a04aa6ef111f4009ab518895e8d6bc8786ea9aa9","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-86.1801-12","next":"us/40-cfr-86.1803-01"},"notice":"GroundRules: Original legal text. Not legal advice."}