CFR›Title 40›Chapter I›Part 1037›Subpart E ContainsSection 1037.401CorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 Subpart E—In-Use Testing Sections 1037.401 § 1037.401 General provisions. Previous D Subpart D—Testing Production Vehicles and Engines Next F Subpart F—Test and Modeling Procedures