U.S. Code of Federal Regulations

Regulations most recently checked for updates: Feb 11, 2026

All TitlesTitle 40Chapter IPart 86Subpart S - 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
§ 86.1801-12 - Applicability.
§ 86.1802-01 - Section numbering; construction.
§ 86.1803-01 - Definitions.
§ 86.1804-01 - Acronyms and abbreviations.
§ 86.1805-04 - Useful life.
§ 86.1805-12 - Useful life.
§ 86.1805-17 - Useful life.
§ 86.1806-17 - Onboard diagnostics.
§ 86.1806-27 - Onboard diagnostics.
§ 86.1807-01 - Vehicle labeling.
§ 86.1808-01 - Maintenance instructions.
§ 86.1809-12 - Prohibition of defeat devices.
§ 86.1810-01 - General standards; increase in emissions; unsafe conditions; waivers.
§ 86.1810-09 - General standards; increase in emissions; unsafe condition; waivers.
§ 86.1810-17 - General requirements.
§ 86.1811-04 - Emission standards for light-duty vehicles, light-duty trucks and medium-duty passenger vehicles.
§ 86.1811-09 - Emission standards for light-duty vehicles, light-duty trucks and medium-duty passenger vehicles.
§ 86.1811-10 - Emission standards for light-duty vehicles, light-duty trucks and medium-duty passenger vehicles.
§ 86.1811-17 - Exhaust emission standards for light-duty vehicles, light-duty trucks and medium-duty passenger vehicles.
§ 86.1811-27 - Criteria exhaust emission standards.
§ 86.1813-17 - Evaporative and refueling emission standards.
§ 86.1815-27 - Battery-related requirements for battery electric vehicles and plug-in hybrid electric vehicles.
§ 86.1816-05 - Emission standards for complete heavy-duty vehicles.
§ 86.1816-08 - Emission standards for complete heavy-duty vehicles.
§ 86.1816-18 - Emission standards for heavy-duty vehicles.
§ 86.1818-12 - Greenhouse gas emission standards for light-duty vehicles, light-duty trucks, and medium-duty passenger vehicles.
§ 86.1819-14 - Greenhouse gas emission standards for medium-duty and heavy-duty vehicles.
§ 86.1820-01 - Durability group determination.
§ 86.1821-01 - Evaporative/refueling family determination.
§ 86.1822-01 - Durability data vehicle selection.
§ 86.1823-08 - Durability demonstration procedures for exhaust emissions.
§ 86.1824-08 - Durability demonstration procedures for evaporative emissions.
§ 86.1825-08 - Durability demonstration procedures for refueling emissions.
§ 86.1826-01 - Assigned deterioration factors for small-volume manufacturers and small-volume test groups.
§ 86.1827-01 - Test group determination.
§ 86.1828-01 - Emission data vehicle selection.
§ 86.1829-15 - Durability and emission testing requirements; waivers.
§ 86.1830-01 - Acceptance of vehicles for emission testing.
§ 86.1831-01 - Mileage accumulation requirements for test vehicles.
§ 86.1832-01 - Optional equipment and air conditioning for test vehicles.
§ 86.1833-01 - Adjustable parameters.
§ 86.1834-01 - Allowable maintenance.
§ 86.1835-01 - Confirmatory certification testing.
§ 86.1836-01 - Manufacturer-supplied production vehicles for testing.
§ 86.1837-01 - Rounding of emission measurements.
§ 86.1838-01 - Small-volume manufacturer certification procedures.
§ 86.1839-01 - Carryover of certification and battery monitoring data.
§ 86.1840-01 - Special test procedures.
§ 86.1841-01 - Compliance with emission standards for the purpose of certification.
§ 86.1842-01 - Addition of a vehicle after certification; and changes to a vehicle covered by certification.
§ 86.1843-01 - General information requirements.
§ 86.1844-01 - Information requirements: Application for certification and submittal of information upon request.
§ 86.1845-04 - Manufacturer in-use verification testing requirements.
§ 86.1846-01 - Manufacturer in-use confirmatory testing requirements.
§ 86.1847-01 - Manufacturer in-use verification and in-use confirmatory testing; submittal of information and maintenance of records.
§ 86.1848-10 - Compliance with emission standards for the purpose of certification.
§ 86.1849-01 - Right of entry.
§ 86.1850-01 - Denial, suspension or revocation of certificate of conformity.
§ 86.1851-01 - Application of good engineering judgment to manufacturers' decisions.
§ 86.1852-01 - Waivers for good in-use emission performance.
§ 86.1853-01 - Certification hearings.
§ 86.1854-12 - Prohibited acts.
§§ 86.1855-86.1859 - §[Reserved]
86.1860-17 - 86.1860-17 How to comply with the Tier 3 and Tier 4 fleet average standards.
§ 86.1861-17 - How do the NMOG + NOX and evaporative emission credit programs work?
§ 86.1862-04 - Maintenance of records and submittal of information relevant to compliance with fleet average standards.
§ 86.1864-10 - How to comply with cold temperature fleet average standards.
§ 86.1865-12 - How to comply with the fleet average CO2 standards.
§ 86.1866-12 - CO2 credits for advanced technology vehicles.
§ 86.1867-12 - CO2 credits for reducing leakage of air conditioning refrigerant.
§ 86.1867-31 - CO2 credits for reducing leakage of air conditioning refrigerant.
§ 86.1868-12 - CO2 credits for improving the efficiency of air conditioning systems.
§ 86.1869-12 - CO2 credits for off-cycle CO2 reducing technologies.
§ 86.1870-12 - CO2 credits for qualifying full-size pickup trucks.
Appendix Appendix I - Appendix I to Subpart S of Part 86—Vehicle Procurement Methodology
Appendix Appendix II - Appendix II to Subpart S of Part 86—As-Received Testing Vehicle Rejection Criteria
Appendix Appendix III - Appendix III to Subpart S of Part 86—As-Received Inspection
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