What is the difference between OBDii, OBD-II, OBD ii and OBD2?
Answer: None, It seems that different corporations used different terminology. The items like connectors, cables or scan tools have no standard of writing except of the OBDii connector should be called J1962.
If you look at some search results on MSN, Google, Yahoo or ASK, the most popular one is OBDii. Personally, I like more the OBD2 term.