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United States law requires that all vehicles of model year 1996 and newer sold in the U.S. be OBD-II-compliant. OBD stands for On-Board Diagnostic; these vehicles all have a data link connector providing a way to access the on-board diagnostic computer system. The car's computer provides valuable diagnostic information regarding many problems the car might experience. Any time the computer detects an issue, it logs all of the sensor readings at the time of detection. This data provides useful information for evaluating the vehicle's performance.