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Certification and Compliance for Vehicles and Engines

  • Certify Vehicles and Engines

    An overview of certification and compliance.

Onroad

(Includes motorcycles, passenger
cars and trucks, commercial trucks,
and buses)
  • Onroad vehicles & engines 

Nonroad

(Includes aircraft, heavy equipment, locomotives, marine vessels, recreation vehicles, and small equipment and tools)
  • Nonroad vehicles and engines

EV-CIS

Engines and Vehicles Compliance Information System (EV-CIS), formerly the Verify System (for onroad and nonroad vehicles and engines)
  • How to register for the EV-CIS

Related Topics

  • Compliance and fuel economy data for vehicles and engines
  • Regulations for emissions from vehicles and engines
  • Importing vehicles and engines
  • Violations and recalls of vehicles and engines
  • Fuel economy
 
How to get a copy of the Certificate of Conformity:
  • for a car or
  • for a nonroad or heavy-duty highway engine

Manufacturer Information and Guidance Letters

Learn more about manufacturer information and guidance letters, including how to find them by year issued and how to get notified when new letters are issued.

  • Manufacturer information, guidance letters and advisory circulars for vehicle, engine, and equipment programs

Search for Documents

Search EPA's Transportation and Air Quality
database for documents:
  • Document Index System (DIS)
In the DIS, you can find:
  • Advisory circulars
  • Applications for certification
  • Certificates of conformity
  • Certificate summary information reports
  • Manufacturer guidance letters
  • EV-CIS (formerly Verify) documentation
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on August 10, 2022
United States Environmental Protection Agency

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