40 CFR § 1045.101 - What exhaust emission standards and requirements must my engines meet?

---
identifier: "/us/cfr/t40/s1045.101"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 1045.101 - What exhaust emission standards and requirements must my engines meet?"
title_number: 40
title_name: "Protection of Environment"
section_number: "1045.101"
section_name: "What exhaust emission standards and requirements must my engines meet?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "U"
subchapter_name: "AIR POLLUTION CONTROLS"
part_number: "1045"
part_name: "CONTROL OF EMISSIONS FROM SPARK-IGNITION PROPULSION MARINE ENGINES AND VESSELS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401-7671q."
regulatory_source: "73 FR 59194, Oct. 8, 2008, unless otherwise noted."
cfr_part: "1045"
---


# 1045.101 What exhaust emission standards and requirements must my engines meet?

(a) You must show that your engines meet the following requirements:

(1) Outboard and personal watercraft engines must meet the exhaust emission standards specified in § 1045.103.

(2) Sterndrive/inboard engines must meet the exhaust emission standards specified in § 1045.105. You may optionally meet these standards earlier than we require, as specified in § 1045.145(b).

(3) Sterndrive/inboard engines must meet the engine-diagnostic requirements in § 1045.110.

(4) All engines must meet the requirements in § 1045.115.

(b) It is important that you read § 1045.145 to determine if there are other interim requirements or interim compliance provisions that apply for a limited time.