OBDI for example would be the B16A. OBDII would be the B16A2. The B16A is JDM and uses only one sensor. The B16A2 on the other hand is USDM and uses 2 sensors. The OBDI is meant for example to be put in the 92-95 Civic and the OBDII for the 96+. Those are just examples though.
