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On-Board Diagnostics (OBD)

OBD Logo - Check Engine Light Vehicle and Engine Manufacturers

Pursuant to the Clean Air Act Amendments of 1990, EPA requires vehicle and engine manufacturers to install OBD systems on light-duty vehicles and trucks, as well as heavy-duty engines. This Web site will help keep you informed of EPA's regulatory efforts, policies, and guidelines regarding OBD, including any issues that might impact your design and manufacturing process.

Use the links below for more information on OBD topics of interest to you:

  • Regulatory and Technical Resources
    Access regulatory and technical documents concerning OBD in light and heavy duty vehicles, as well as state inspection and maintenance programs.
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This page is maintained by EPA's Office of Transportation and Air Quality (OTAQ).
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