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On-Board Diagnostics (OBD)

Light Duty Vehicles

 Final Rule: Regulations Requiring Onboard Diagnostic Systems on 2010 and Later Heavy-duty Engines used in Highway Vehicles Over 14,000 Pounds; Revisions to Onboard Diagnostic Requirements for Diesel Highway Heavy-duty Vehicles Under 14,000 Pounds (signed December 4, 2008)

This page includes OBD resources for light duty vehicles, as well as archives of additional sources.

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.

Regulations

Final Rule: Control of Air Pollution From New Motor Vehicles and New Motor Vehicle Engines; Modification of Federal On-Board Diagnostic Regulations for: Light-Duty Vehicles, Light-Duty Trucks, Medium Duty Passenger Vehicles, Complete Heavy Duty Vehicles and Engines Intended for Use in Heavy Duty Vehicles Weighing 14,000 pounds GVWR or less (signed November 29, 2005)

Partial Withdrawal (published August 14, 2003) - Modification of Federal On Board Diagnostic Regulations for: Light Duty Vehicles, Light Duty Trucks, Medium Duty Passenger Vehicles, Complete Heavy Duty Vehicles and Engines Intended for Use in Heavy Duty Vehicles Weighing 14,000 Pounds GVWR or Less; Extension of Acceptance of California OBD II Requirements

Direct Final Rulemaking (published June 17, 2003) - Modification of Federal On-Board Diagnostic Regulations for: Light Duty Vehicles, Light Duty Trucks, Medium Duty Passenger Vehicles, Complete Heavy Duty Vehicles and Engines Intended for Use in Heavy Duty Vehicles Weighing 14,000 Pounds GVWR or Less; Extension of Acceptance of California
OBD II Requirements

Notice of Proposed Rulemaking (published June 17, 2003) - Modification of Federal On Board Diagnostic Regulations for: Light Duty Vehicles, Light Duty Trucks, Medium Duty Passenger Vehicles, Complete Heavy Duty Vehicles and Engines Intended for Use in Heavy Duty Vehicles Weighing 14,000 Pounds GVWR or Less; Extension of Acceptance of California OBD II Requirements

Final Rule (published December 22, 1998) - Modification of Federal Onboard Diagnostic Regulations for Light Duty Vehicles and Light Duty Trucks; Extension of Acceptance of California OBD II Requirements

Primary Contact:
Arvon Mitcham
Phone: 734 214-4522
E-mail: mitcham.arvon@epa.gov

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Manufacturers' Guidance

Manufacturer Guidance Letter VPCD-98-14, LDV On-Board Diagnostic Guidance - Diagnostic Link Connector Location and Accessibility (with attachment, 7K, GIF, December 14, 1998) (also available as a PDF file, 3 pp, 36K)

Dear Manufacturer letter regarding the policy for certification requests prior to publication of the final OBD rulemaking to accept California OBD II requirements beyond the 1998 model year (November 7, 1997) (also available as a PDF file, 2 pp, 6K)

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Technical Documents

On-Board Diagnostic Hand-Held Scan Tool Technology: Adherence to the Society of Automotive Engineers Requirements for Scan Tools and an Evaluation of Overall Scan Tool Capability (PDF) (27 pp, 69K, EPA420-R-00-017, October 2000)

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