obd = on board diagnostics (sp?) i believe. it's bassicly emisisons control equiptment. obd0 is pre 92. obd1 is '92-'95. and obd2 is 96+. but there's like a obd2-a and obd2-b i believe. they're all just different versions. and with each new version comes more sensors and equiptment and cleaner air .
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