standard

OBD-II

OBD-II (pronounced "Oh Bee Dee - Two") which stands for On-Board Diagnostics second revision, is a standard for automotive computer operation and diagnosis. It became mandatory in 1996 for all cars sold within the US to be equipped with an OBD-II system. Some USDM cars went OBD-II as early as 1994. Computer-controlled cars prior to OBD-II are referred to as OBD-I cars, though there was not actually any standard prior to OBD-II. In the U.S., OBD-II's main job is to make sure that vehicle emissions do not exceed 1.5 times the "FTP", or federal test procedure, which measures vehicle emissions. OBD-II provides a specification for what data must be collected, and how it should be presented to the technician.

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