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On-Board Diagnostics (OBD)

Car Care — What You Can Do

Do you service your vehicle on a regular basis? If not, you should consider doing so. You'll be doing yourself—and the environment—a big favor. Without routine maintenance, minor problems not easily detected by sight or sound can lead to poor performance, increased emissions, and expensive repairs. This is where your vehicle's OBD system plays a pivotal role. By immediately notifying you of a potential problem with your vehicle, your "Check Engine" light helps keep your automobile performing at its optimal level.

To learn more about general car care practices, including ways to reduce your vehicle's emissions, explore the links below.

NOTE: You will need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader.

This page is maintained by EPA's Office of Transportation and Air Quality (OTAQ).
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