Whats an OBD2
OBD = "on board diagnostics" https://en.wikipedia.org/wiki/On-board_diagnostics
It is a computer that controls all the engines functions. All cars went to a OBDII computer in 1996, before that there was the OBD1 computer which started in 1981. When something is not right with the engine, or transmission, a parameter is out of range with a sensor indicating a problem, thus then a code is set into the computer so when you scan the vehicle from the ALDL port with a automotive scanner, you pick up the code, codes to know where and what to look at for repair.
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