OnBoard Diagnostics: Also known as OBD. Mandatory since 1981 on U.S. cars. There are two kinds of OBD systems. OBD1 is for cars made from 1981 to 1995. OBD2 is for 1996 and newer vehicles. Since the first one falls within the smog-era, that’s what we’re covering here, through ’83. General speaking, OBD is a […]
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