http://x431parts.blogspot.tw/2015/04/indentify-your-super-16-connector-is.html
Some guys use fake super16 connector instead of genuine very a very low price less than $90.
This kind of fake S16 is very easyto go down and make your X431 can't work well when connects to the cars.
Here is a very simple way to identify if your Super16 is original or not.Genuine Super 16 has serial number which printed by laser at its bottom.Like picture showed.The fake Super 16 has no this identification.
See as attached.It is original