---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchU/part1066"
level: "part"
label: "Part 1066"
heading: "Vehicle-Testing Procedures"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchU-part1066"
sections_count: 84
---

# Part 1066 — Vehicle-Testing Procedures

Title 40 C.F.R. — Protection of Environment › Chapter I — Environmental Protection Agency › Subchapter U — Air Pollution Controls

## Contents

- [Subpart A — Applicability and General Provisions](/cfr/40/chI-subchU-part1066-subpartA.md)
- [Subpart B — Equipment, Measurement Instruments, Fuel, and Analytical Gas Specifications](/cfr/40/chI-subchU-part1066-subpartB.md)
- [Subpart C — Dynamometer Specifications](/cfr/40/chI-subchU-part1066-subpartC.md)
- [Subpart D — Coastdown](/cfr/40/chI-subchU-part1066-subpartD.md)
- [Subpart E — Preparing Vehicles and Running an Exhaust Emission Test](/cfr/40/chI-subchU-part1066-subpartE.md)
- [Subpart F — Electric Vehicles and Hybrid Electric Vehicles](/cfr/40/chI-subchU-part1066-subpartF.md)
- [Subpart G — Calculations](/cfr/40/chI-subchU-part1066-subpartG.md)
- [Subpart H — Cold Temperature Test Procedures](/cfr/40/chI-subchU-part1066-subpartH.md)
- [Subpart I — Exhaust Emission Test Procedures for Motor Vehicles](/cfr/40/chI-subchU-part1066-subpartI.md)
- [Subpart J — Evaporative Emission Test Procedures](/cfr/40/chI-subchU-part1066-subpartJ.md)
- [Subpart K — Definitions and Other Reference Material](/cfr/40/chI-subchU-part1066-subpartK.md)