The Air Resources Board has filed a regulation with the Secretary of State that requires measurement of the effectiveness of on-board diagnostic (OBD) systems in heavy-duty engines. It also specifies the required capabilities of OBD systems installed in passenger cars, light duty trucks, and medium duty vehicles, and updates the regulation that specifies the emission standards pertinent to OBD systems. The affected code is Cal. Code Regs. tit. 13, §§1971.5, 1968.2, and 1971.1. It was filed on May 18 and becomes effective June 17, 2010. http://www.oal.ca.gov/res/docs/pdf/notice/22z-2010.pdf pp. 794-795.