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The California Air Resource Board (CARB) required that, by model year 1996, all vehicles sold in California (under 8500 GVWR) contain a certain minimum "On-Board Diagnostic" capability to diagnose emissions-related failures of the engine control system. These diagnostic requirements have been designated as OBD II (On-Board Diagnostics, Phase II) with a goal of monitoring "all of the emissions-related components on-board the vehicle for proper operation." CARB's intent with the OBD II program is to "permit the State's Inspection and Maintenance Program to evolve into a check of the on-board computer for the presence of Diagnostic Trouble Codes (DTCs); under the hood and tailpipe inspections would no longer be required."