I would visit the automotive car repair wiki, which has a database of OBD2 locations for all vehicles. http://www.fixexpert.com/wiki/odb2.php?page=odb2&id=20618 In your case its on the driver ride side, See photo below. http://www.fixexpert.com/obd2/data/Volvo/s40/2003.jpg If you wish to look up others OBDII port locations for other vehicles try the main link at: http://www.fixexpert.com/wiki/OBD-2+Location Good Luck.
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