One of the most exciting improvements in the automobile industry was the addition of on-board diagnostics (OBD) on vehicles, or in more basic terms, the computer that activates the vehicle's "CHECK ENGINE" light. OBDI was designed to monitor manu-facturer-specific systems on vehicles builtfrom 1981 to 1995. Then came the develop-ment of OBDII, which is on all 1996 cars and light trucks sold in the U.S. Like its predecessor, OBDII was adopted as part of a government mandate to lower vehicle emissions. But what makes OBDII unique is its universal application for all late model cars and trucks ¨C domestic and import. This sophisticated program in the vehicle's main computer system is designed to detect failures in a range of systems, and can be accessed through a universal OBDII port, which is usually found under the dashboard. For all OBD systems, if a problem is found, the computer turns on the "CHECK ENGINE" light to warn the driver, and sets a Diagnostic Trouble Code (DTC) to identify where the problem occurred. A special diagnostic tool, such as the OBDII Scan Tool, is required to retrieve these codes, which consumers and professionals use as a starting point for repairs.
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