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Cars and Light Trucks

Inspection & Maintenance (I/M) - Regulations

Vehicle inspection and maintenance (I/M) programs help improve air quality by identifying cars and truck with high emissions and that may need repairs.  Owners or operators of vehicles with high emissions are notified to make any repairs so that emissions are within legal limits.  The 1990 Amendments to the Clean Air Act (CAA) made I/M mandatory for several areas across the country.  This page contains regulations promulgated by EPA to facilitate the states implementation of this CAA mandate.

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.

Amendments to Vehicle Inspection Maintenance Program Requirements to Address the 8-Hour National Ambient Air Quality Standard for Ozone
Contact:  Dave Sosnowski at 734-214-4823 or sosnowski.dave@epa.gov
Amendments to Vehicle Inspection Maintenance Program Requirements Incorporating the On-Board Diagnostic Check
Additional Flexibility Amendments to Vehicle Inspection Maintenance Program Requirements.
Contact:  Dave Sosnowski at 734-214-4823 or sosnowski.dave@epa.gov
I/M Program Requirement - On-Board Diagnostic Checks Amendment to the Final Rule
Contact:  Leila Cook at 734-14-4820 or cook.leila@epa.gov

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Minor Amendments to Inspection Maintenance Program Evaluation Requirements; Amendment to the Final Rule
Contact:  Dave Sosnowski at 734-214-4823 or sosnowski.dave@epa.gov
September 23, 1996, I/M Program Requirements Minor Amendments
I/M Requirement for On-Board Diagnostic Checks
Inspection/Maintenance Ozone Transport Region (OTR) Flexibility Amendments.
  • Final Rule as published in the Federal Register on July 25, 1996.
  • Proposed Rule as published in the Federal Register October 23, 1995.

July 1996, Full list of I/M regulations and guidance documents

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I/M Flexibility
  • Final Rule as published in the Federal Register on September 18, 1995.
  • Proposed Rule as published in the Federal Register on April 28, 1995.

December 12, 1995, Guidance on Interim Approval of I/M Plans (PDF) (8pp, 34K)

I/M Redesignation
  • Final Rule as published in the Federal Register on January 5, 1995
  • Proposed Rule as published in the Federal Register on June 28, 1994.

Full 1992 I/M Regulations (PDF) (72pp, 226K)

1992 Enhanced I/M Tech Support Document without appendices (PDF) (140pp, 340K)

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