---
kind: "section"
citation: "40 C.F.R. § 86.601-84"
title: "40"
number: "86.601-84"
heading: "Applicability."
url: "https://uscodex.org/cfr/40/86.601-84"
---

# §86.601-84. Applicability.


The provisions of this subpart apply to light-duty vehicles, light-duty trucks, and heavy-duty vehicles. However, manufacturers that optionally certify heavy-duty vehicles based on chassis testing under [§ 86.1863-07](/cfr/40/86.1863-07.md) may choose instead to perform selective enforcement audits using the procedures specified in [40 CFR part 1068](/cfr/40/part1068.md), subpart E. References to “light-duty vehicle” or “LDT” in this subpart G shall be deemed to include light-duty trucks and heavy-duty vehicles as appropriate.

- (a) **Section numbering; construction.**
  - (1) The model year of initial applicability is indicated by the two digits following the hyphen of the section number. A section remains in effect for subsequent model years until it is superseded.
  - (2) A section reference without a model year suffix shall be interpreted to be a reference to the section applicable to the appropriate model year.
- (b) References in this subpart to engine families and emission control systems shall be deemed to refer to durability groups and test groups as applicable for manufacturers certifying new light-duty vehicles and light-duty trucks under the provisions of subpart S of this part.

## Notes

### Amendments

[49 FR 69, Jan. 3, 1984. Redesignated at 54 FR 2122, Jan. 19, 1989, as amended at 62 FR 31234, June 6, 1997; 64 FR 23922, May 4, 1999; 75 FR 22980, Apr. 30, 2010]

### Source

Source: 41 FR 31483, July 28, 1976, unless otherwise noted.

### Authority

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

### Amendments

[49 FR 69, Jan. 3, 1984. Redesignated at 54 FR 2122, Jan. 19, 1989, as amended at 62 FR 31234, June 6, 1997; 64 FR 23922, May 4, 1999; 75 FR 22980, Apr. 30, 2010]