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; Extension of Acceptance of California OBD II Requirements

Due to receipt of adverse comments, EPA is withdrawing two specific regulatory revisions included in the direct final rule that was published in the Federal Register on June 17, 2003 (68 FR 35792) related to EPA's On-board Diagnostics (OBD) regulations. EPA published both the direct final rule and a concurrent notice of proposed rulemaking to amend and revise certain provisions of the Federal OBD regulations for purposes of updating the acceptable version of the California OBD II regulations, that allows compliance with California OBD II regulations to satisfy Federal OBD regulations, and to update the incorporation by reference of standardized practices developed by the Society of Automotive Engineers (SAE) and the International Organization for Standardization (ISO) to incorporate recently published versions. The only provisions being withdrawn are the provisions that prohibit the use SAE J1939 beyond the 2007 model year.