Page 3 of 248
Maintenance and Specifications 196
Engine compartment 197
Engine oil 198
Battery 202
Fuel information 210
Air filter(s) 223
Part numbers 228
Refill capacities 228
Lubricant specifications 230
Accessories 235
Index 238
All rights reserved. Reproduction by any means, electronic or mechanical
including photocopying, recording or by any information storage and retrieval
system or translation in whole or part is not permitted without written
authorization from Ford Motor Company. Ford may change the contents without
notice and without incurring obligation.
Copyright © 2003 Ford Motor Company
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Table of Contents
3
Page 9 of 248
Vehicle Symbol Glossary
Power Windows
Front/Rear
Power Window Lockout
Child Safety Door
Lock/UnlockInterior Luggage
Compartment Release
Symbol
Panic AlarmEngine Oil
Engine CoolantEngine Coolant
Temperature
Do Not Open When HotBattery
Avoid Smoking, Flames,
or SparksBattery Acid
Explosive GasFan Warning
Power Steering FluidMaintain Correct Fluid
LevelMAX
MIN
Emission SystemEngine Air Filter
Passenger Compartment
Air FilterJack
Check fuel capLow tire warning
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Introduction
9
Page 13 of 248
Safety belt
Illuminates to remind you to fasten
your safety belts. For more
information, refer to theSeating
and safety restraintschapter.
Air bag readiness
Illuminates to confirm that the air
bags (front or side) are operational.
If the light fails to illuminate,
continues to flash or remains on,
have the system serviced immediately.
Charging system
Illuminates when the battery is not
charging properly.
Engine oil pressure (if equipped)
Illuminates when the oil pressure
falls below the normal range. Check
the oil level and add oil if needed.
Refer toEngine oilin the
Maintenance and specificationschapter.
Traction ControlAdvancTrac active (if equipped)
Illuminates when the Traction
Controlsystem is active. It will be
lit for a minimum of four seconds or
for the duration of the Traction
Controlevent.
For more information, refer to the
Drivingchapter.
AIR
BAG
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Instrument Cluster
13
Page 19 of 248
Battery voltage gauge (if equipped)
Indicates battery voltage. If the
pointer moves and stays outside the
normal operating range (as
indicated), have the vehicle’s
electrical system checked as soon as
possible.
Fuel gauge
Displays approximately how much fuel is in the fuel tank. The fuel gauge
may vary slightly when the vehicle is in motion or on a grade.
When refueling the vehicle from empty indication, the amount of fuel
that can be added will be less than the advertised capacity due to the
reserve fuel.
•Standard instrument cluster
•Optional instrument cluster
A minimum of four gallons must be
added or removed from the fuel
tank in order for the gauge to
instantaneously update. If less than
four gallons is added, the gauge will
take between five to ten minutes to
update.
VOLTSH
L
E
FUELF
F
E
/2 1
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Instrument Cluster
19
Page 82 of 248

•To close from the vent position, press and hold the rear portion of the
control.
Do not let children play with the moon roof. They may seriously
hurt themselves.
HOMELINKWIRELESS CONTROL SYSTEM (IF EQUIPPED)
The HomeLinkWireless Control System, located on the overhead
console, provides a convenient way to replace up to three hand-held
transmitters with a single built-in device. This feature will learn the radio
frequency codes of most current transmitters to operate garage doors,
entry gate operators, security systems, entry door locks, and home or
office lighting.
When programming your HomeLinkWireless Control System to
a garage door or gate, be sure that people and objects are out of
the way to prevent potential harm or damage.
Do not use the HomeLinkWireless Control System with any garage
door opener that lacks safety stop and reverse features as required by
U.S. federal safety standards (this includes any garage door opener
model manufactured before April 1, 1982). A garage door which cannot
detect an object, signaling the door to stop and reverse, does not meet
current U.S. federal safety standards. For more information, contact
HomeLinkat:www.homelink.comor1–800–355–3515.
Retain the original transmitter for use in other vehicles as well as for
future programming procedures (i.e. new HomeLinkequipped vehicle
purchase). It is also suggested that upon the sale of the vehicle, the
programmed Homelinkbuttons be erased for security purposes, refer to
Programmingin this section.
Programming
Do not program HomeLinkwith the vehicle parked in the garage.
Note:Some vehicles may require the ignition switch to be turned to the
second (or “ACC”) position for programming and/or operation of the
HomeLink. It is also recommended that a new battery be placed in the
hand-held transmitter of the device being programmed to HomeLinkfor
quicker training and accurate transmission of the radio-frequency signal.
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Driver Controls
82
Page 88 of 248

The message center will remain in
the DTE function until the SELECT
control is pressed to change
functions.
DTE is calculated using a running
average fuel economy, which is
based on your recent driving history
of 800 km (500miles). This value is
not the same as the average fuel
economy display. The running average fuel economy is reinitialized to a
factory default value if the battery is disconnected.
If “CO” or “CS” is displayed, there is a problem with the fuel indication
system and you should contact your dealer for service as soon as
possible.
AVG FUEL ECONOMY (average fuel economy)
Select this function to display your
average fuel economy in liters/100
km or miles/gallon.
If you calculate your average fuel
economy by dividing miles traveled by gallons used, your figure may be
different than displayed for the following reasons:
•your vehicle was not perfectly level during fill-up
•differences in the automatic shut-off points on the fuel pumps at
service stations
•variations in top-off procedure from one fill-up to another
•rounding of the displayed values to the nearest 0.1 liter (gallons)
Press the RESET control while AVG
ECON is displayed to reset the
function.
The average displayed is the average
since the last reset.RESET E/M SELECT
TRIP
ATRIP
BAVG
SPEED
DISTANCE
TO EMPTYAVG FUEL
ECONOMY
RESET E/M SELECT
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Driver Controls
88
Page 96 of 248

7. After a five to ten second delay, the door locks will cycle lock/unlock
to confirm successful programming.
8. After having waited the necessary time for the programming to
confirm, turn the ignition to OFF.
Sounding a panic alarm
Press this control to activate the
alarm.
To deactivate the alarm, press the
control again or turn the ignition to
ACC or ON.
Panic alarm will only operate with
the ignition in the OFF position.
Opening the trunk
Press the control once to open the
trunk.
Ensure that the trunk is closed and
latched before driving your vehicle.
Failure to latch the trunk may cause
objects to fall out of the trunk or
block the rear view. This feature will
not work with the transmission out
of P (Park) or N (Neutral) if the
ignition is in either the ACC or ON
position.
Replacing the battery
The remote transmitter is powered by one coin type three-volt lithium
battery CR2032 or equivalent. Typical operating range will allow you to
be up to 10 meters (33 feet) away from your vehicle. A decrease in
operating range can be caused by the following factors:
•Weather conditions
•Nearby radio towers
•Structures around the vehicle
•Other vehicles parked next to the vehicle
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
96
Page 97 of 248

To replace the battery:
1. Twist a thin coin between the two
halves of the transmitter near the
key ring. DO NOT TAKE THE
FRONT PART OF THE
TRANSMITTER APART.
2. Place the positive (+) side of new
battery in the same orientation.
Refer to the diagram inside the
transmitter unit.
3. Snap the two halves back
together.
Replacement of the battery willnotcause the remote transmitter to
become deprogrammed from your vehicle. The remote transmitter should
operate normally after battery replacement.
Replacing lost transmitters
Take all your vehicle’s transmitters
to your dealer if service is required.
If a remote transmitter has been lost
and you would like to remove it
from the vehicle’s memory, or you
would like to purchase additional
remote transmitters and have them
programmed to your vehicle:
•Takeallyour vehicle’s
transmitters to your dealer for
programming, or
•Perform the following programming procedure yourself.
Place the key in the ignition and
turn from 2 (LOCK) to 3 (OFF) and
cycle between 3 (OFF) and 4 (ON)
four times in rapid succession within
3 seconds. After doors lock/unlock,
press any control on all transmitters
(up to four). When completed, turn
the ignition to 3 (OFF).
All transmittersmustbe
programmed at the same time.
3
1
2
5
4
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
97