Volvo: check engine light, coin holder, glt

Question
I have a 93 850 glt and the check engine light just came on.  I also have an odb2 diagnostic checker that you can plug into cars computers.  Will this work for my car?  If so, where do i plug it in? is there any codes i need?
Thanks  

Answer
Mitch,
Under the coin holder is the OBD plug. See what codes you get. Try this if that will not work. http://www.alldatapro.com/alldata/PRO~V53910578~C12306~R0~OD~N/0/41746052/566218...