On-Board Diagnostics (OBD)
OBD and Inspection and Maintenance - Archive
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 Incorporating the Onboard Diagnostic Check (PDF) (173K)
Notice of Proposed Rulemaking signed September 12, 2000, and published in the Federal Register September 20, 2000. Proposes to extend deadline for implementing OBD checks in I/M programs for one year. The notice also proposes to revise failure and rejection criteria and clarifies that dual testing of OBD-equipped vehicles is neither recommended nor required.
Phone: 734 214-4823
I/M Program Requirement - On-Board Diagnostic Checks Amendment to the Final Rule (PDF) (50K) - April 27, 1998
Fact Sheet (also available as a PDF file, 13K)
Phone: 734 214-7928
IM Program Requirement - On-Board Diagnostic Checks; Amendment to the Final Rule - December 16, 1997
Fact Sheet (also available as a PDF file, 11K)
Phone: 734 214-4820
- I/M Requirement for On-Board Diagnostic Checks
August 27, 1996 Correction of August 6, 1996 Final Rule
On page 40946, in the first column, in Sec. 51.372(b)(3), in the last line, "August 6, 1996" should read "August 6, 1998".
August 6, 1996 Final Rule
August 18, 1995 Proposed Rule