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Oh this is an easy one OBD2 is an on board diagnostic system made mandatory by the goverment to better controll emissions and make it easier to scan all vehicles, all OBD2 cars have the same diagnostic plug and share the same code numbers, also all OBD2 cars have after cat O2 sensors to monitor the efficiancy of the the cats. Before OBD2 every car maker had there own special plugs and codes and required much more equiptment to diagnose ( some are impossible ie. Volvo, Range Rover) and they didn't monitor cat efficiancy or gas evap controls.
Hope this answers most of your curiosity.
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92 SVX #772 140k 6speed, ECU Tune stage II, Koni/Ground control, 3,270lbs.
91 Legacy Turbo 5spd. FMIC, crappy stock turbo, ACT clutch.
78 BRAT (New toy) (Soon to be EJ22T powered)
90 240 SX. RB25 powered!! DRIFT!!!111!!! (GF's car)
To many cars to spend time on teh web!
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