2004 FORD MUSTANG check engine light

On board diagnostics (OBD-II)
Your vehicle is equipped with a computer that
monitors the engine’s emission control system. This
system is commonly known as the On Board
Diagnostics System (OBD-II). This OBD-II system
protects the environment by ensuring that your
vehicle continues to meet government emission
standards. The OBD-II system also assists the
service technician in properly servicing your vehicle.
When theCheck Engine/Service Engine Soonlight
illuminates, the OBD-II system has detected a
malfunction. Temporary malfunctions may cause
yourCheck Engine/Service Engine Soonlight to
illuminate. Examples are:
1. The vehicle has run out of fuel. (The engine may
misfire or run poorly.)
2. Poor fuel quality or water in the fuel.
3. The fuel cap may not have been securely
tightened.
These temporary malfunctions can be corrected by
filling the fuel tank with good quality fuel and/or
properly tightening the fuel cap. After three driving
cycles without these or any other temporary
malfunctions present, theCheck Engine/Service
Engine Soonlight should turn off. (A driving cycle
consists of a cold engine startup followed by mixed
city/highway driving.) No additional vehicle service is
required.
If theCheck Engine/Service Engine Soonlight
remains on, have your vehicle serviced at the first
available opportunity.
Readiness for Inspection/Maintenance (I/M)
testing
In some localities, it may be a legal requirement to
pass an I/M test of the on-board diagnostics system.
If your“Check Engine/Service Engine Soon”light is
on, refer to the description in theWarning lights
and chimessection of theInstrument cluster
chapter. Your vehicle may not pass the I/M test with
the“Check Engine/Service Engine Soon”light on.
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Maintenance and Specifications
193

A
Air bag supplemental
restraint system .. 79–80
and child safety
seats ......................... 81
description .............. 80
disposal .................... 84
driver air bag .......... 82
indicator light ......... 83
operation ................. 82
passenger air bag ... 82
Air cleaner filter ..... 215
Antifreeze (see
Engine coolant) ...... 174
Anti-lock brake system
(see Brakes) .... 104–105
Audio system
(see Radio) .... 18, 20, 25
Automatic
transmission ............ 108
driving an automatic
overdrive ............... 111
fluid, adding .......... 196
fluid, checking ...... 196
fluid, refill
capacities ............... 215
fluid,
specification .......... 221
Auxiliary power
point ........................... 45
Axle
lubricant
specifications. 218, 221
refill capacities ...... 215
traction lok ............ 108
B
Battery ..................... 171acid, treating
emergencies .......... 171
jumping a disabled
battery ................... 136
maintenance-free .. 171
replacement,
specifications ........ 215
servicing ................ 171
BeltMinder ................. 74
Brakes .............. 104–105
anti-lock ......... 104–105
anti-lock brake
system (ABS)
warning light ......... 104
fluid, checking and
adding .................... 196
fluid, refill
capacities ............... 215
fluid,
specifications. 218, 221
lubricant
specifications 218, 221
parking .................. 106
shift interlock ........ 108
Bulbs .......................... 38
C
Capacities for
refilling fluids .......... 215
Cargo net ................... 44
Cassette tape
player ................... 18, 25
CD-single premium ... 20
Cell phone use .......... 49
Child safety
restraints ................... 85
child safety belts .... 85
Child safety seats ...... 88
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Index
228

E
Emergencies, roadside
jump-starting ........ 136
Emergency Flashers 124
Emission control
system ...................... 191
Engine ...................... 221
cleaning ................. 155
coolant ................... 174
idle speed control . 171
lubrication
specifications. 218, 221
refill capacities ...... 215
service
points ............. 164–166
Engine block
heater ....................... 103
Engine oil ................ 167
checking and
adding .................... 167
dipstick .................. 167
filter,
specifications. 170, 215
recommendations . 170
refill capacities ...... 215
specifications. 218, 221
Exhaust fumes ........ 103
F
Floor mats ................. 50
Fluid capacities ....... 215
Foglamps ................... 35
Fuel .......................... 182
calculating fuel
economy ................ 187
cap ......................... 184
capacity ................. 215choosing the
right fuel ................ 185
comparisons with
EPA fuel economy
estimates ............... 191
detergent in fuel ... 187
filling your vehicle
with fuel. 182, 184, 188
filter,
specifications. 187, 215
improving fuel
economy ................ 187
octane
rating ..... 185–186, 221
quality .................... 186
running out of fuel 187
safety information
relating to automotive
fuels ....................... 182
Fuses ................ 125–126
G
Gas cap (see
Fuel cap) ................. 184
Gas mileage (see
Fuel economy) ........ 187
Gauges ....................... 14
H
Hazard flashers ....... 124
Head restraints ......... 64
Headlamps ................. 35
aiming ...................... 37
bulb specifications .. 39
daytime running
lights ........................ 35
flash to pass ............ 36
high beam ............... 36
replacing bulbs ....... 40
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Index
230

Oil (see
Engine oil) ............... 167
Overdrive ................. 109
P
Parking brake .......... 106
Parts (see Motorcraft
parts) ....................... 215
Power distribution box
(see Fuses)
............. 128
Power door locks
...... 54
Power mirrors
........... 46
Power point
............... 45
Power steering
........ 106
fluid, checking and
adding
.................... 194
fluid, refill
capacity
................. 215
fluid,
specifications. 218, 221
Power Windows
......... 45
R
Radio
.............. 18, 20, 25
Relays
...................... 125
Remote entry
system
........................ 57
illuminated entry
.... 60
locking/unlocking
doors
........................ 54
opening the trunk
... 57
Roadside
assistance
................ 122S
Safety Belt
Maintenance .............. 78
Safety belts (see Safety
restraints) ............ 68–72
Safety defects,
reporting .................. 152
Safety restraints .. 68–72
belt minder ............. 74
extension
assembly .................. 78
for adults ........... 69–72
for children ....... 84–85
safety belt
maintenance ............ 78
warning light and
chime ................. 73–74
Safety seats for
children ...................... 88
Seat belts (see Safety
restraints) .................. 68
Seats .......................... 64
child safety seats .... 88
front seats ............... 64
Servicing your
vehicle ...................... 161
Setting the clock
AM/FM/In-dash
6 CD ......................... 30
MACH MP3
system ..................... 23
Spare tire (see
Changing the Tire) . 130
Spark plugs,
specifications ... 215, 221
Specification chart,
lubricants ......... 218, 221
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Index
232