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92-95 civics are OBDI
96-00 civics are OBDII
The diference between them is that the OBDII has more sensors to monitor your car. IE. 92-95 have just one O2 sensors and 96-00 has 2 O2 sensors. Thats why if you put a header from a 92 95 to a 96-00 car your check engine light goes on cause youre leavin one sensor un hooked.
Basically with the OBDII system you get a beter idea of whats hapening with your engine cause it has more sensors to monitor your motor.
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