I believe the obd port is located by the parking brake and just above it.
The 1996 Mercury Grand Marquis OBD 2 port is on under driver side dash next to center console
On a 1993 Mercury Grand Marquis ( which is OBD I , EEC IV ) ( there should be an EEC TEST connection in the engine compartrment )
The 2003 Honda Civic OBD 2 port is behind center console
There should be an EEC TEST connection in the engine compartment ( a 1994 Mercury Grand Marquis is OBD I , EEC-IV )
The 1999 Mercury Cougar OBD 2 port is under driver side dash left of steering column
The 1995 Grand Marquis is a OBD2 and it should be located on driver side under dash
The 2003 Saturn Ion OBD 2 port is on bottom edge of dash; above hood release
The 2003 Toyota Tundra OBD 2 port is under driver side dash above accelerator pedal
The 2003 Hyundai Elantra OBD 2 port is on lower edge of dash between steering column & hood release
The 1999 Mercury Cougar OBD 2 port is under driver side dash left of steering column
The 2000 Mercury Cougar OBD 2 port is under driver side dash next to kick panel