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OBD stands for OnBoard Diagnostics. In 1996 cars were switched over to a new version of the OBD (OBD2) in order to reduce emissions.
92-95=OBD1
96+=OBD2
OBD2 was also split into two sections, OBD2a and OBD2b. The split occured in 98-99ish, I can't remember off the top of my head.
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