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  2. Regulations for Emissions from Vehicles and Engines

Final Rule for Modification of Federal Onboard Diagnostic Regulations for: LD Vehicles, LD Trucks, MD Passenger Vehicles, Complete HD Vehicles and Engines Intended for Use in HD Vehicles Weighing 14,000 Pounds GVWR or Less

Final Rule for Modification of Federal Onboard Diagnostic Regulations for: LD Vehicles, LD Trucks, MD Passenger Vehicles, Complete HD Vehicles and Engines Intended for Use in HD Vehicles Weighing 14,000 Pounds GVWR or Less
Basic Information
Code of Federal Regulations Citations
  • 40 CFR Part 86

On this page:

  • Rule Summary
  • Rule History
  • Additional Resources

Rule Summary

In this action, EPA finalized requirements associated with the Federal on-board diagnostic (OBD) system regulations that were withdrawn from a prior direct final rule. On June 17, 2003, EPA published both a direct final rule and a concurrent notice of proposed rulemaking (68 FR 35972 and 68 FR 35830 respectively) to amend and revise certain provisions of the Federal OBD regulations. EPA published the direct final rule believing that no adverse comments would be received. However, due to the receipt of an adverse comment, EPA published a partial withdrawal notice on August 14, 2003 (68 FR 48561) withdrawing two specific regulatory amendments included in the direct final rule, and the remaining provisions of the direct final rule became effective on August 18, 2003. This action finalized the portion of the direct final rule that was withdrawn, with revisions and clarifications suggested by commenters during the public comment period.

  • Final Rule (PDF)(9 pp, 181 K, published December 20, 2005)

Rule History

  • Proposed Rule and Related Materials

Additional Resources

  • Direct Final Rule (PDF)(10 pp, 169 K, published June 17, 2003)
  • Partial Withdrawal of Direct Final Rule (PDF)(2 pp, 131 K, published August 14, 2003)

Regulations for Emissions from Vehicles and Engines

  • Onroad
    • Passenger Vehicles
    • Commercial Trucks & Buses
    • Motorcycles
  • Nonroad
    • Aircraft
    • Heavy Equipment
    • Locomotives
    • Marine
    • Recreational Vehicles
    • Small Equipment & Tools
  • Greenhouse Gas
Contact Us About Regulations for Emissions from Vehicles and Engines
Contact Us About Regulations for Emissions from Vehicles and Engines to ask a question, provide feedback, or report a problem.
Last updated on July 22, 2024
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