On-Board Diagnostics (OBD) Testing Devices PRINT Date February 14, 2023 Contact HD Vehicle Enforcement Email HDVehicleEnforcement@arb.ca.gov Phone (916) 229-0492 Categories Topics Enforcement Programs Enforcement of Clean Truck Check HD I/M Regulation Heavy-Duty Inspection and Maintenance (HD I/M) Regulation: On-Board Diagnostics (OBD) Testing Devices
