If you come from USA, When you import Vehicles and Engines, they must with EPA sign.
Overview of Certification and Compliance for Vehicles and Engines
About Certification and Compliance
EPA regulations apply to virtually every vehicle, engine, and gallon of transportation fuel sold in the United States. It is EPA’s job to ensure that sources comply with emissions and fuel economy requirements. Compliance activities are critically important to achieving the air quality benefits promised by emissions regulations.
EPA uses a variety of testing and reporting programs to monitor compliance with emissions regulations. The programs may apply to vehicles and engines before they are produced (pre-production), while they are in production and after they are in customer service (post-production).
Certificates of Conformity
The Clean Air Act requires that all engines and vehicles be covered by a certificate of conformity before they can enter into commerce. A certificate of conformity demonstrates that the respective engine or vehicle conforms to all of the applicable emission requirements. The certificate represents engines and vehicles covered by a specific engine family or, in the case of light-duty vehicles, a specific test group for each manufacturer.


