The 1996 Mercury Grand Marquis OBD 2 port is on under driver side dash next to center console
There should be an EEC TEST connection in the engine compartment ( a 1994 Mercury Grand Marquis is OBD I , EEC-IV )
On a 1993 Mercury Grand Marquis ( which is OBD I , EEC IV ) ( there should be an EEC TEST connection in the engine compartrment )
The 1995 Grand Marquis is a OBD2 and it should be located on driver side under dash
I believe the obd port is located by the parking brake and just above it.
On a 1999 Mercury Grand Marquis : The Original Equipment engine cooling thermostat would have been ( around 192 * Fahrenheit )
( # 16 ) is a 20 amp fuse for the cigarette lighter and OBD II in a 2007 Mercury Grand Marquis ( in the fuse panel below and to the left of the steering wheel by the brake pedal )
The OBD connector is under the dash on the driver side.
( # 27 ) is a 20 amp fuse for the cigarette lighter , OBD II , and power point
The OBD II port connector is located to the left of the steering wheel, just beneath the dash panel.
The 1996 Mercury Sable the OBD 2 connector is under drivers dash next to kick panel
The 1996 Pontiac Grand Prix OBD 2 port is on lower edge of dash; right of steering column
The 1996 Mercury Cougar OBD 2 port is under passenger side dash above glove box