Site Feedback

Website Feedback

This contact form is only for website help or website suggestions. If you have questions or comments regarding a published document please contact the publishing agency. Comments or questions about document content can not be answered by OFR staff. Please do not provide confidential information or personal data.

Title 40

Displaying title 40, up to date as of 7/17/2026. Title 40 was last amended 7/16/2026.
view historical versions
  1. Title 40 —Protection of Environment
  2. Chapter I —Environmental Protection Agency
  3. Subchapter C —Air Programs
  4. Part 86 —Control of Emissions from New and In-Use Highway Vehicles and Engines
  5. Subpart S   View Full Text
  • Details
  • Print
  • Search
  • Subscribe
  • Timeline
  • Go to Date
  • Published Edition
  • Developer Tools
eCFR Content

The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR.

Learn more about the eCFR, its status, and the editorial process.

Title 40Protection of EnvironmentPart / Section
Chapter IEnvironmental Protection Agency1 – 1099
Subchapter CAir Programs50 – 99
Part 86Control of Emissions from New and In-Use Highway Vehicles and Engines86.1 – 86.1999
Subpart SGeneral Compliance Provisions for Control of Air Pollution From New and In-Use Light-Duty Vehicles, Light-Duty Trucks, and Heavy-Duty Vehicles86.1801-12 – 86.1869-12
§ 86.1801-12Applicability.
§ 86.1802-01Section numbering; construction.
§ 86.1803-01Definitions.
§ 86.1804-01Acronyms and abbreviations.
§ 86.1805-04Useful life.
§ 86.1805-12Useful life.
§ 86.1805-17Useful life.
§ 86.1806-17Onboard diagnostics.
§ 86.1806-27Onboard diagnostics.
§ 86.1807-01Vehicle labeling.
§ 86.1808-01Maintenance instructions.
§ 86.1809-12Prohibition of defeat devices.
§ 86.1810-01General standards; increase in emissions; unsafe conditions; waivers.
§ 86.1810-09General standards; increase in emissions; unsafe condition; waivers.
§ 86.1810-17General requirements.
§ 86.1811-04Emission standards for light-duty vehicles, light-duty trucks and medium-duty passenger vehicles.
§ 86.1811-09Emission standards for light-duty vehicles, light-duty trucks and medium-duty passenger vehicles.
§ 86.1811-10Emission standards for light-duty vehicles, light-duty trucks and medium-duty passenger vehicles.
§ 86.1811-17Exhaust emission standards for light-duty vehicles, light-duty trucks and medium-duty passenger vehicles.
§ 86.1811-27Criteria exhaust emission standards.
§ 86.1813-17Evaporative and refueling emission standards.
§ 86.1816-05Emission standards for complete heavy-duty vehicles.
§ 86.1816-08Emission standards for complete heavy-duty vehicles.
§ 86.1816-18Emission standards for heavy-duty vehicles.
§ 86.1820-01Durability group determination.
§ 86.1821-01Evaporative/refueling family determination.
§ 86.1822-01Durability data vehicle selection.
§ 86.1823-08Durability demonstration procedures for exhaust emissions.
§ 86.1824-08Durability demonstration procedures for evaporative emissions.
§ 86.1825-08Durability demonstration procedures for refueling emissions.
§ 86.1826-01Assigned deterioration factors for small-volume manufacturers and small-volume test groups.
§ 86.1827-01Test group determination.
§ 86.1828-01Emission data vehicle selection.
§ 86.1829-15Durability and emission testing requirements; waivers.
§ 86.1830-01Acceptance of vehicles for emission testing.
§ 86.1831-01Mileage accumulation requirements for test vehicles.
§ 86.1832-01Optional equipment and air conditioning for test vehicles.
§ 86.1833-01Adjustable parameters.
§ 86.1834-01Allowable maintenance.
§ 86.1835-01Confirmatory certification testing.
§ 86.1836-01Manufacturer-supplied production vehicles for testing.
§ 86.1837-01Rounding of emission measurements.
§ 86.1838-01Small-volume manufacturer certification procedures.
§ 86.1839-01Carryover of certification data.
§ 86.1840-01Special test procedures.
§ 86.1841-01Compliance with emission standards for the purpose of certification.
§ 86.1842-01Addition of a vehicle after certification; and changes to a vehicle covered by certification.
§ 86.1843-01General information requirements.
§ 86.1844-01Information requirements: Application for certification and submittal of information upon request.
§ 86.1845-04Manufacturer in-use verification testing requirements.
§ 86.1846-01Manufacturer in-use confirmatory testing requirements.
§ 86.1847-01Manufacturer in-use verification and in-use confirmatory testing; submittal of information and maintenance of records.
§ 86.1848-10Compliance with emission standards for the purpose of certification.
§ 86.1849-01Right of entry.
§ 86.1850-01Denial, suspension or revocation of certificate of conformity.
§ 86.1851-01Application of good engineering judgment to manufacturers' decisions.
§ 86.1852-01Waivers for good in-use emission performance.
§ 86.1853-01Certification hearings.
§ 86.1854-12Prohibited acts.
§§ 86.1855-86.1859 [Reserved]
86.1860-17How to comply with the Tier 3 and Tier 4 fleet average standards.
§ 86.1861-17How do the NMOG + NOX and evaporative emission credit programs work?
§ 86.1862-04Maintenance of records and submittal of information relevant to compliance with fleet average standards.
§ 86.1864-10How to comply with cold temperature fleet average standards.
§ 86.1868-12CO2 credits for improving the efficiency of air conditioning systems.
§ 86.1869-12CO2 credits for off-cycle CO2 reducing technologies.
Appendix I to Subpart S of Part 86
Vehicle Procurement Methodology
Appendix II to Subpart S of Part 86
As-Received Testing Vehicle Rejection Criteria
Appendix III to Subpart S of Part 86
As-Received Inspection
eCFR Content