On-Road Heavy-Duty Current Standards, Test Procedures and Regulatory Documents Categories Topics On-Road Heavy-Duty Vehicles Type Information Contact Medium and Heavy-Duty Vehicle Hotline Email 8666DIESEL@arb.ca.gov Phone (866) 634-3735 / (866) 6DIESEL Section 1956.8, Title 13, California Code of Regulations contains California's emission standards for on-road heavy-duty engines and vehicles, and the following test procedures, as incorporated by reference. Heavy-Duty Otto-Cycle Engines and Vehicles "California Exhaust Emission Standards and Test Procedures for 1987 through 2003 Model Heavy-Duty Otto-Cycle Engines and Vehicles", as amended on December 27, 2000 "California Exhaust Emission Standards and Test Procedures for 2004 and Subsequent Model Heavy-Duty Otto-Cycle Engines and Vehicles", as amended September 9, 2021Heavy-Duty Diesel Engines and Vehicles "California Exhaust Emission Standards and Test Procedures for 1985 through 2003 Model Heavy-Duty Diesel Engines and Vehicles", as amended on December 12, 2002"California Exhaust Emission Standards and Test Procedures for 2004 and Subsequent Model Heavy-Duty Diesel Engines and Vehicles", as amended September 9, 2021 Related Resources Enhanced Electric and Fuel Cell Vehicle Certification Clean Truck Check — Heavy-Duty Inspection and Maintenance (HD I/M) Regulation: Freight Contractor, Broker, and Applicable Freight Facility Requirements Mobile Source Strategy
Medium and Heavy-Duty Vehicle Hotline Email 8666DIESEL@arb.ca.gov Phone (866) 634-3735 / (866) 6DIESEL
