check engine FORD MUSTANG 2021 Owners Manual

Transmission
Manual Transmission
................................164
Automatic Transmission ..........................
165
Technical Specifications - Mach 1 .........
168
Rear Axle
Limited Slip Differential ............................
170
Brakes
General Information .....................................
171
Hints on Driving With Anti-Lock Brakes ........................................................................\
..
171
Parking Brake .................................................
172
Hill Start Assist .............................................
173
Traction Control
Principle of Operation ................................
174
Using Traction Control ...............................
174
Stability Control
Principle of Operation ................................
175
Using Stability Control ...............................
176
Parking Aids
Principle of Operation ................................
178
Rear Parking Aid ...........................................
179
Rear View Camera ......................................
180
Cruise Control
What Is Cruise Control ..............................
184
Switching Cruise Control On and Off ........................................................................\
.
184
Setting the Cruise Control Speed .........
184
Canceling the Set Speed ..........................
185
Resuming the Set Speed ..........................
185
Cruise Control Indicators ..........................
185
Using Adaptive Cruise Control ...............
185
Driving Aids
Driver Alert ......................................................
191Lane Keeping System
................................
192
Blind Spot Information System .............
196
Cross Traffic Alert ........................................
198
Steering ...........................................................
201
Pre-Collision Assist ....................................
202
Drive Control - Mach 1 ..............................
206
Drive Control ................................................
209
Load Carrying
Load Limit .......................................................
213
Towing
Towing a Trailer - Mach 1 ...........................
218
Towing a Trailer ............................................
218
Recommended Towing Weights ...........
219
Essential Towing Checks .........................
220
Transporting the Vehicle - Mach 1 ........
222
Towing the Vehicle on Four Wheels .....
225
Convertible Top
Opening the Convertible Top .................
226
Closing the Convertible Top ....................
227
Driving Hints
Reduced Engine Performance ...............
229
Economical Driving ....................................
229
Cold Weather Precautions ......................
230
Breaking-In ....................................................
230
Driving Through Water ..............................
230
Floor Mats .......................................................
231
Roadside Emergencies
Roadside Assistance .................................
232
Hazard Flashers ...........................................
233
Fuel Shutoff ..................................................
233
Jump Starting the Vehicle .......................
234
Post-Crash Alert System .........................
236
Transporting the Vehicle ..........................
237
4
Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Table of Contents

Customer Assistance
Getting the Services You Need
..............238
In California (U.S. Only) ...........................
239
The Better Business Bureau (BBB) Auto Line Program (U.S. Only) ....................
240
Utilizing the Mediation/Arbitration Program (Canada Only) .......................
241
Getting Assistance Outside the U.S. and Canada ........................................................
241
Ordering Additional Owner's Literature ........................................................................\
243
Reporting Safety Defects (U.S. Only) ........................................................................\
243
Reporting Safety Defects (Canada Only) ........................................................................\
243
Fuses
Fuse Specification Chart .........................
245
Changing a Fuse .........................................
254
Maintenance
General Information ..................................
256
Opening and Closing the Hood .............
256
Under Hood Overview - 2.3L EcoBoost™ ........................................................................\
258
Under Hood Overview - 5.0L .................
259
Under Hood Overview - 5.0L, Mach 1 .......................................................................
260
Engine Oil Dipstick ......................................
261
Engine Oil Check ..........................................
261
Oil Change Indicator Reset ......................
261
Changing the Engine Air Filter - 5.0L, Mach 1 .........................................................
262
Changing the Engine Air Filter - 2.3L EcoBoost™/5.0L ....................................
263
Engine Coolant Check ..............................
264
Manual Transmission Fluid Check - 6-Speed Manual Transmission – 3160
........................................................................\
268
Manual Transmission Fluid Check - 6-Speed Manual Transmission – MT82
........................................................................\
268 Automatic Transmission Fluid Check
........................................................................\
269
Brake Fluid Check .......................................
269
Clutch Fluid Check - Manual Transmission ............................................
270
Power Steering Fluid Check ....................
270
Changing the 12V Battery ........................
270
Adjusting the Headlamps ........................
272
Washer Fluid Check ...................................
274
Fuel Filter ........................................................
274
Checking the Wiper Blades .....................
274
Changing the Wiper Blades ....................
274
Changing a Bulb ..........................................
275
Track Use
Track Use - Mach 1 ......................................
276
Track Use .......................................................
283
Vehicle Care
General Information ..................................
289
General Information - GT500/Mach 1 ........................................................................\
289
Cleaning Products .....................................
290
Cleaning the Exterior - Mach 1 ................
291
Cleaning the Exterior ..................................
291
Waxing ............................................................
293
Cleaning the Engine - Mach 1 .................
293
Cleaning the Engine ...................................
293
Cleaning the Windows and Wiper Blades ........................................................................\
294
Cleaning the Interior ..................................
294
Cleaning the Instrument Panel and Instrument Cluster Lens ......................
295
Cleaning Leather Seats ............................
295
Repairing Minor Paint Damage .............
296
Cleaning the Wheels .................................
296
Vehicle Storage ...........................................
296
Cleaning the Convertible Top ................
298
Body Styling Kits ........................................
298
5
Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Table of Contents

Thanks to a popular mix of appearance,
features and power, the 1969-73 Mach 1's
proved to be everyman's muscle car, and
have earned a respected place in Mustang
performance lore. Beyond those classic
years, the Mach 1 carried over for all five
years of the often overlooked 1974-78's
before a hiatus that ended with the
modern and muscular 2003-04's. Mach
1’
s return to the Mustang lineup for 2021
will add a new chapter on modern-day
muscle for this beloved model, and will
cement its rightful place near the very top
of Mustang performance history.
John M. Clor
Enthusiast Communications Manager /
FORD PERFORMANCE
SYMBOLS GLOSSARY
These are some of the symbols you may
see on your vehicle. Air conditioning system
Air conditioning system lubricant
type
Anti-lock braking system
Avoid smoking, flames or sparks
Battery
Battery acid
Brake fluid - non petroleum
based Brake system
Brake system
Cabin air filter
Check fuel cap
Child safety door lock or unlock
Child seat lower anchor
Child seat tether anchor
Cruise control
Do not open when hot
Engine air filter
Engine coolant
Engine coolant temperature
Engine oil
Explosive gas
Fan warning
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Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing IntroductionE162384 E231157 E270480 E139223 E141128 E71340

Gauge Package (If Equipped)
Oil Pressure Gauge
Indicates the engine oil pressure.
Vacuum or Vacuum and Boost Gauge
Indicates the vacuum or vacuum and boost
pressure in the intake.
WARNING LAMPS AND
INDICATORS
The following warning lamps and
indicators alert you to a vehicle condition
that may become serious. Some lamps
illuminate when you start your vehicle to
make sure they work. If any lamps remain
on after starting your vehicle, refer to the
respective system warning lamp for further
information.
Note:
Some warning indicators appear in
the information display and operate the
same as a warning lamp but do not
illuminate when you start your vehicle.
Adaptive Cruise Control Indicator
(If Equipped) It illuminates when you switch
the system on. It illuminates white when the system is in
standby mode. It illuminates green when
you set the adaptive cruise speed.
See
Using Adaptive Cruise Control
(page 185).
Airbag Warning Lamp If it does not illuminate when you
switch the ignition on, continues
to flash or remains on when the
engine is running, this indicates a
malfunction. Have your vehicle checked
as soon as possible.
Anti-Lock Brake System Warning
Lamp If it illuminates when you are
driving, this indicates a
malfunction. Your vehicle
continues to have normal braking without
the anti-lock brake system function. Have
your vehicle checked as soon as possible.
Automatic Headlamp High Beam
Indicator
(If Equipped) It illuminates when the system
automatically turns the
headlamp high beam on.
See
What Is Automatic High Beam
Control (page 84).
Battery If it illuminates while driving, it
indicates a malfunction. Switch
off all unnecessary electrical
equipment and have the system checked
by your authorized dealer immediately.
94
Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Instrument ClusterE196366 E144524 E67017

Blind Spot Information System
Indicator (If Equipped)
It illuminates when you switch
the system off.
See
Blind Spot Information
System (page 196).
Brake System Warning Lamp WARNING:
Driving your vehicle
with the warning lamp on is dangerous.
A significant decrease in braking
performance may occur. It may take you
longer to stop your vehicle. Have your
vehicle checked as soon as possible.
Driving extended distances with the
parking brake engaged can cause brake
failure and the risk of personal injury.
Note: Indicators vary depending on region.
This lamp is a dual function lamp and will
illuminate when:
• You apply the parking brake with the
ignition on.
• Your vehicle has a brake fault or low
brake fluid level, regardless of parking
brake position. If the lamp illuminates when you
are moving, you may have the
parking brake applied. Make sure
the parking brake is off. Have
your vehicle checked as soon as
possible if the lamp continues to
illuminate.
Cruise Control Indicator It illuminates when you switch
the system on.
See
Switching Cruise Control
On and Off (page 184). Direction Indicator It illuminates when the left or
right direction indicator or the
hazard warning flasher is turned
on. Flashes during operation. An increase
in the rate of flashing warns of a failed
indicator bulb.
Door Ajar Warning Lamp Displays when the ignition is on
and any door is not completely
closed.
Engine Coolant Temperature
Warning Lamp If it illuminates when your vehicle
is moving, this indicates that the
engine is overheating. Stop your
vehicle as soon as it is safe to do so and
switch the engine off. Have your vehicle
checked as soon as possible.
Fasten Seatbelt Warning Lamp It illuminates and a chime
sounds until you fasten the
seatbelts.
Front Fog Lamp Indicator (If Equipped) It illuminates when you switch
the front fog lamps on.
Heads Up Display
(If Equipped) A red beam of lights will
illuminate on the windshield in
certain instances when using
adaptive cruise control or the collision
warning system. It will also illuminate
momentarily when you start your vehicle
to make sure the display works.
95
Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Instrument ClusterE151262 E270480 E71340 E71880 E156133

Headlamp High Beam Indicator
It will illuminate when you switch
the high beam headlamps on. It
will flash when you use the
headlamp flasher.
Hood Ajar It illuminates when the ignition
is on and the hood is not
completely closed.
Lane Keeping System Lamp (If
Equipped) Illuminates when the system
activates.
Launch Control Illuminates when this feature is
ready, including both slip control
and engine RPM hold.
Illuminates when only engine
RPM hold is active. See
Track
Use (page 276).
Low Beam Malfunction Lights when there is a
malfunction with the low beam
headlamp bulb.
Low Fuel Level Warning Lamp If it illuminates when you are
driving, refuel as soon as
possible.
Low Tire Pressure Warning Lamp Illuminates when your tire
pressure is low. If the lamp
remains on with the engine
running or when driving, check your tire
pressure as soon as possible. It also illuminates momentarily when you
switch the ignition on to confirm the lamp
is functional. If it does not illuminate when
you switch the ignition on, or begins to
flash at any time, have the system checked
by your authorized dealer.
Low Washer Fluid Level Warning
Lamp
Illuminates when the washer
fluid is low.
Oil Pressure Warning Lamp Illuminates when you switch the
ignition on.
If it illuminates when the engine
is running this indicates a malfunction.
Stop your vehicle as soon as it is safe to
do so and switch the engine off. Check the
engine oil level. If the oil level is sufficient,
this indicates a system malfunction. Have
your vehicle checked as soon as possible.
See
Engine Oil Check (page 261).
Parking Lamps Illuminate when you switch the
parking lamps on.
Powertrain Fault Illuminates when the system
detects a powertrain fault.
Contact an authorized dealer as
soon as possible.
Service Engine Soon If it illuminates when the engine
is running this indicates a
malfunction. The On Board
Diagnostics system has detected a
malfunction of the vehicle emission control
system.
96
Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Instrument Cluster E159324 E144813 E234583 E255688 E181350 E132353

If it flashes, engine misfire may be
occurring. Increased exhaust gas
temperatures could damage the catalytic
converter or other vehicle components.
Drive in a moderate fashion (avoid heavy
acceleration and deceleration) and have
your vehicle immediately serviced.
It illuminates when you switch the ignition
on prior to engine start to check the bulb
and to indicate whether your vehicle is
ready for Inspection and Maintenance
(I/M) testing.
Normally, it illuminates until the engine is
cranked and automatically turns off if no
malfunctions are present. However, if after
15 seconds it flashes eight times, this
indicates that your vehicle is not ready for
Inspection and Maintenance (I/M) testing.
See Catalytic Converter (page 161).
Shift Indicator
(If Equipped) Illuminates to inform you that
shifting to a higher gear as
indicated may give better fuel
economy and lower CO2
emissions. It will not illuminate during
periods of high acceleration, braking or
when you press the clutch pedal.
Stability Control and Traction
Control Indicator Flashes during operation.
If it does not illuminate when you
switch the ignition on, or remains
on when the engine is running, this
indicates a malfunction. Have your vehicle
checked as soon as possible.
Note: The system automatically turns off
if there is a malfunction.
See
Using Stability Control (page 176).
See Using Traction Control (page 174). Stability Control and Traction
Control Off Warning Lamp Illuminates when you switch the
system off.
Trunk Ajar Illuminates when the ignition is
on and the trunk is not
completely closed.
AUDIBLE WARNINGS AND
INDICATORS
Keyless Warning Alert
The horn sounds twice when you exit your
vehicle with the passive key and your
vehicle is in ON, indicating your vehicle is
still on. The horn also sounds twice when
you exit your vehicle and attempt to lock
the doors manually when the passive key
is still in the vehicle. The doors will not lock
if the passive key remains in the vehicle.
Headlamps On Warning Tone
Sounds when you remove the key from the
vehicle and you have left the headlamps
or parking lamps on.
Parking Brake On Warning Tone
Sounds when you have left the parking
brake on and drive your vehicle. If the
warning tone remains on after you release
the parking brake, have the system
checked by your authorized dealer
immediately.
97
Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Instrument Cluster E138639 E130458 E159323

Action
Message
The battery management system determines that the 12V batteryis at a low state of charge. Start the engine to charge the batteryor charge the battery using an aftermarket battery charger. This
message clears once you restart your vehicle and the battery state of charge has recovered.
Battery State of
Charge Low
The battery management system detects an extended low-voltagecondition. Your vehicle disables various features to help preserve the battery. Turn off as many of the electrical loads as soon aspossible to improve system voltage. If the system voltage has recovered, the disabled features operate again as normal.
Low Battery
Features Tempor- arily Turned Off
The battery management system determines that the battery is ata low state of charge. Turn your ignition off as soon as possible to protect the battery. This message clears once you restart your
vehicle and the battery state of charge has recovered. Turning off
unnecessary electrical loads allow faster battery state-of-charge recovery.
Turn Power Off To
Save Battery
Blind Spot Information and Cross Traffic Alert System Action
Message
A fault with the system has occurred. Have the system checked as soon as possible.
Blindspot System
Fault
The system sensors are blocked. See Blind Spot Information
System (page 196).
Blindspot Not
Available Sensor Blocked See Manual
The blind spot information system and cross traffic alert system
sensors are blocked. See
Blind Spot Information System (page
196).
Cross Traffic Not
Available Sensor Blocked See Manual
A fault with the system has occurred. Have the system checked as soon as possible.
Cross Traffic
System Fault
115
Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Information Displays

Exhaust Mode
Action
Message
Indicates that the exhaust state selected, through the menu or drivemode selection, is for use on the track and may not comply with local noise regulations. Only on vehicles with active exhaust.
For Track Use See
Manual
Fuel Action
Message
An early reminder of a low fuel condition.
Fuel Level Low
The fuel fill inlet may not be properly closed.
Check Fuel Fill
Inlet
Hill Start Assist Action
Message
Hill start assist is not available. Have the system checked. See Hill Start Assist (page 173).
Hill Start Assist
Not Available
Keys and Passive Key Action
Message
A reminder to press the brake while starting the vehicle.
To START Press
Brake
A reminder to depress the clutch pedal on manual transmission while starting the vehicle.
To START Press
Clutch
The system does not detect a key in your vehicle. See
Keyless
Starting (page 147).
No Key Detected
You pressed the start/stop button to switch off the engine and yourvehicle does not detect your passive key inside your vehicle.
Restart Now or
Key is Needed
Your vehicle is in the accessory ignition state.
Accessory Power
is Active
There is a problem with your vehicle ’s starting system. See an
authorized dealer for service.
Starting System
Fault
117
Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Information Displays

Action
Message
You have successfully programmed a passive key to the system.
Key Program
Successful
You have failed to program a passive key to the system.
Key Program
Failure
You have programmed the maximum number of keys to the system.
Max Number of
Keys Learned
You have not programmed enough keys to the system.
Not Enough Keys
Learned
The key battery is low. Change the battery as soon as possible.
Key Battery Low
Replace Soon
Inform the driver that they are exiting the vehicle and the engine is on.
Engine ON
Maintenance Action
Message
Stop your vehicle as soon as safely possible and turn off the engine.
Check the oil level. If the warning stays on or continues to come onwith your engine running, have the system checked as soon as possible.
Low Engine Oil
Pressure
The engine oil life remaining is 10% or less.
Change Engine Oil
Soon
The oil life left is at 0%.
Oil Change
Required
The brake fluid level is low, inspected the brake system immediately.See Brake Fluid Check (page 269).
Brake Fluid Level
Low
The brake system needs servicing. Stop your vehicle in a safe place. Have the system checked.
Check Brake
System
Indicates that your vehicle is still in Transport mode. This may not
allow some features to operate properly. Have the system checked.
Transport Mode
Contact Dealer
Indicates that your vehicle is still in Factory mode. This may not
allow some features to operate properly. Have the system checked.
Factory Mode
Contact Dealer
The powertrain needs service due to a powertrain malfunction.
See Manual
118
Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Information Displays