Subpart X. Subpart X—Determination of Model Year for Motor Vehicles and Engines Used in Motor Vehicles Under Section 177 and Part A of Title II of the Clean Air Act

• § 85.2301 - Applicability.
• § 85.2302 - Definition of model year.
• § 85.2303 - Duration of model year.
• § 85.2304 - Definition of production period.
• § 85.2305 - Duration and applicability of certificates of conformity.