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On-Board Diagnostics, or OBD, in an automotive context, is a generic
term referring to a vehicle's self-diagnostic and reporting capability.
OBD systems give the vehicle owner or a repair technician access to state
of health information for various vehicle sub-systems. The amount of
diagnostic information available via OBD has varied widely since the
introduction in the early 1980s of on-board vehicle computers, which made
OBD possible. Early instances of OBD would simply illuminate a malfunction
indicator light, or MIL, if a problem were detected—but would not provide
any information as to the nature of the problem. Modern OBD
implementations use a standardized fast digital communications port to
provide myriad realtime data in addition to a standardized series of
diagnostic trouble codes, or DTCs, which allow one to rapidly identify and
remedy malfunctions within the vehicle.
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