US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 1042 — CONTROL OF EMISSIONS FROM NEW AND IN-USE MARINE COMPRESSION-IGNITION ENGINES AND VESSELSSubpart E — In-use Testing1042.40140 C.F.R. § 1042.401General Provisions.Last amended: 2016Year: 2026Length: 15 wordsOfficial source Cite as 40 C.F.R. § 1042.401 (2026)We may perform in-use testing of any engine subject to the standards of this part.