---
kind: "section"
citation: "40 C.F.R. § 85.1901"
title: "40"
number: "85.1901"
heading: "Applicability."
url: "https://uscodex.org/cfr/40/85.1901"
---

# §85.1901. Applicability.

- (a) The requirements of this subpart shall be applicable to all 1972 and later model year motor vehicles and motor vehicle engines, except that the provisions of [40 CFR 1068.501](/cfr/40/1068.501.md) apply instead for heavy-duty motor vehicle engines and heavy-duty motor vehicles certified under [40 CFR part 86](/cfr/40/part86.md), subpart [A](/cfr/40/subpartA.md), or [40](/cfr/40/subpart40.md) CFR part [1036](/cfr/40/part1036.md) or [1037](/cfr/40/part1037.md) starting January 1, 2018.
- (b) The requirement to report emission-related defects affecting a given class or category of vehicles or engines shall remain applicable for five years from the end of the model year in which such vehicles or engines were manufactured.

## Notes

### Amendments

[81 FR 73972, Oct. 25, 2016, as amended at 88 FR 4472, Jan. 24, 2023]

### Authority

Authority: Secs. 208(a) and 301(a), Clean Air Act, as amended (42 U.S.C. 1857f-6(a) and 1857g(a)).

### Source

Source: 42 FR 28128, June 2, 1977, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Amendments

[81 FR 73972, Oct. 25, 2016, as amended at 88 FR 4472, Jan. 24, 2023]