CFR›Title 40›Chapter I›Part 1036›Subpart F›40 CFR 1036.503 Citation40 CFR 1036.503CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 § 1036.503 xxxLink to an amendment published at 91 FR 7779, Feb. 18, 2026. Previous 1036.501 § 1036.501 General testing provisions. Next 1036.505 § 1036.505 Engine data and information to support vehicle certification.