# 40 C.F.R. § 86.1802-01 (2026): Section numbering; construction

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1802_01

## Section

- **Citation:** 40 C.F.R. § 86.1802-01 (2026)
- **Heading:** Section numbering; construction
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 40 CFR: Protection of Environment / Chapter I / Part 86 / Subpart S / § 86.1802-01: § 86.1802-01   Section numbering › construction.

## Text

(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. (b) A section reference without a model year suffix refers to the section applicable for the appropriate model year. (c) If a regulation in this subpart references a section that has been superseded or no longer exists, this should be understood as a reference to the same section for the appropriate model year.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 However, this does not apply if the reference to a superseded section specifically states that the older provision applies instead of any updated provisions from the section in effect for the current model year; this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. [81 FR 73982, Oct. 25, 2016]

## Nearby sections

- [40 C.F.R. § 86.1801-12 (2026) § 86.1801-12   Applicability.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1801_12.md)
- [40 C.F.R. § 86.1802-01 (2026) § 86.1802-01   Section numbering; construction.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1802_01.md)
- [40 C.F.R. § 86.1803-01 (2026) § 86.1803-01   Definitions.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1803_01.md)
- [40 C.F.R. § 86.1804-01 (2026) § 86.1804-01   Acronyms and abbreviations.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1804_01.md)
- [40 C.F.R. § 86.1805-04 (2026) § 86.1805-04   Useful life.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1805_04.md)
- [40 C.F.R. § 86.1805-12 (2026) § 86.1805-12   Useful life.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1805_12.md)
- [40 C.F.R. § 86.1805-17 (2026) § 86.1805-17   Useful life.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1805_17.md)
- [40 C.F.R. § 86.1806-17 (2026) § 86.1806-17   Onboard diagnostics.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1806_17.md)
- [40 C.F.R. § 86.1806-27 (2026) § 86.1806-27   Onboard diagnostics.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1806_27.md)
- [40 C.F.R. § 86.1807-01 (2026) § 86.1807-01   Vehicle labeling.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1807_01.md)
- [40 C.F.R. § 86.1808-01 (2026) § 86.1808-01   Maintenance instructions.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1808_01.md)
- [40 C.F.R. § 86.1809-12 (2026) § 86.1809-12   Prohibition of defeat devices.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1809_12.md)
- [40 C.F.R. § 86.1810-01 (2026) § 86.1810-01   General standards; increase in emissions; unsafe conditions; waivers.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1810_01.md)
- [40 C.F.R. § 86.1810-09 (2026) § 86.1810-09   General standards; increase in emissions; unsafe condition; waivers.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1810_09.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T40_P86_S86_1802_01. Check the current official text before relying on it. Not legal advice.