2021 FORD MUSTANG check engine

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
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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
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Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Information Displays

•
Press the brake pedal (automatic
transmission) or clutch pedal (manual
transmission), and then press the
button for any length of time. An
indicator light on the button illuminates
when the ignition is on and when the
engine starts.
STEERING WHEEL LOCK
Your vehicle has an electronically
controlled steering wheel lock that
automatically operates.
The steering wheel will lock shortly after
you have parked your vehicle and the
passive key is outside it or when you lock
your vehicle.
Note: The steering wheel will not lock when
the ignition is on or when your vehicle is
moving.
Unlocking the Steering Wheel
The steering wheel unlocks when the
system detects a valid passive key inside
your vehicle. If the steering wheel relocks,
switch the ignition on to unlock it.
Note: You may have to slightly rotate the
steering wheel to assist unlocking it.
STARTING A GASOLINE
ENGINE
When you start the engine, the idle speed
increases, this helps to warm up the
engine. If the engine idle speed does not
slow down automatically, have your
vehicle checked by an authorized dealer. Note:
You can crank the engine for a total
of 60 seconds (without the engine starting)
before the starting system temporarily
disables. The 60 seconds does not have to
be all at once. For example, if you crank the
engine three times for 20 seconds each
time, without the engine starting, you
reached the 60-second time limit. A
message appears in the information display
alerting you that you exceeded the cranking
time. You cannot attempt to start the engine
for at least 15 minutes. After 15 minutes, you
are limited to a 15-second engine cranking
time. You need to wait 60 minutes before
you can crank the engine for 60 seconds
again.
Before starting the engine, check the
following:
• Make sure all occupants have fastened
their seatbelts.
• Make sure the headlamps and
electrical accessories are off.
• Make sure the parking brake is on.
• Move the transmission selector lever
to park (P) (automatic transmission)
or neutral (manual transmission)
Note: Do not touch the accelerator pedal.
Note: You must have your intelligent access
key in the vehicle in order to shift the
transmission out of position P.
1. Fully press the brake pedal.
2. Press the button.
The system does not function if:
• The key frequencies are jammed.
• The key battery has no charge.
If you are unable to start the engine, do the
following:
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Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Starting and Stopping the Engine

•
You can reset the timer by interacting
with your vehicle (such as pressing the
brake pedal or accelerator pedal).
• You can temporarily switch off the
shutdown feature any time the ignition
is on (for the current ignition cycle
only). Use the information display to
do so. See Information Displays
(page 99).
• During the countdown before engine
shutdown, you are prompted to press
OK or RESET (depending on your type
of information display) to temporarily
switch the feature off (for the current
ignition cycle only).
Stopping the Engine When Your
Vehicle is Stationary
1. Move the transmission selector lever to park (P) (automatic transmission)
or neutral (manual transmission).
2. Press the button once.
3. Apply the parking brake.
Note: This switches off the ignition, all
electrical circuits, warning lamps and
indicators.
Note: If the engine is idling for 30 minutes,
the ignition and engine automatically shut
down.
Stopping the Engine When Your
Vehicle is Moving WARNING:
Switching off the
engine when the vehicle is still moving
will result in a loss of brake and steering
assistance. The steering will not lock, but
higher effort will be required. When the
ignition is switched off, some electrical
circuits, including air bags, warning lamps
and indicators may also be off. If the
ignition was turned off accidentally, you
can shift into neutral (N) and re-start the
engine. 1. Move the transmission selector lever
to the neutral position and use the
brakes to bring your vehicle to a safe
stop.
2. When your vehicle has stopped, move the transmission selector lever to park
(P) (automatic transmission) or
neutral (manual transmission).
3. Press and hold the button for one second, or press it three times within
two seconds.
4. Apply the parking brake.
Guarding Against Exhaust Fumes WARNING:
If you smell exhaust
fumes inside your vehicle, have your
vehicle checked by your authorized
dealer immediately. Do not drive your
vehicle if you smell exhaust fumes.
Carbon monoxide is present in exhaust
fumes. Take precautions to avoid its
dangerous effects.
Important Ventilating Information
If you stop your vehicle and the leave the
engine idling for long periods, we
recommend that you do one of the
following:
• Open the windows at least
1 in
(2.5 cm).
• Set your climate control to outside air.
ENGINE BLOCK HEATER
(IF
EQUIPPED) WARNING:
Failure to follow engine
block heater instructions could result in
property damage or serious personal
injury.
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Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Starting and Stopping the Engine

WARNING: Do not use your heater
with ungrounded electrical systems or
two-pronged adapters. There is a risk of
electrical shock. WARNING: Do not fully close the
hood, or allow it to drop under its own
weight when using the engine block
heater. This could damage the power
cable and may cause an electrical short
resulting in fire, injury and property
damage.
Note: The heater is most effective when
outdoor temperatures are below
0°F
(-18°C).
The heater acts as a starting aid by
warming the engine coolant. This allows
the climate control system to respond
quickly. The equipment includes a heater
element, installed in the engine block and
a wire harness. You can connect the
system to a grounded 120-volt AC
electrical source.
We recommend that you do the following
for a safe and correct operation:
• Use a 16-gauge outdoor extension cord
that is product certified by
Underwriter ’s Laboratory (UL) or
Canadian Standards Association
(CSA). This extension cord must be
suitable for use outdoors, in cold
temperatures, and be clearly marked
Suitable for Use with Outdoor
Appliances. Do not use an indoor
extension cord outdoors. This could
result in an electric shock or become a
fire hazard.
• Use as short an extension cord as
possible.
• Do not use multiple extension cords. •
Make sure that when in operation, the
extension cord plug and heater cord
plug connections are free and clear of
water. This could cause an electric
shock or fire.
• If the block heater cord is under the
hood, Do Not remove the wiring from
its original location. Do Not close the
hood on the extension wiring.
• Make sure your vehicle is parked in a
clean area, clear of combustibles.
• Make sure the heater, heater cord and
extension cord are firmly connected.
• Check for heat anywhere in the
electrical hookup once the system has
been operating for approximately 30
minutes.
• Make sure the system is unplugged and
properly stowed before starting and
driving your vehicle. Make sure the
protective cover seals the prongs of the
block heater cord plug when not in use.
• Make sure the heater system is
checked for proper operation before
winter.
Using the Engine Block Heater
Make sure the receptacle terminals are
clean and dry prior to use. Clean them with
a dry cloth if necessary.
The heater uses 0.4 to 1.0 kilowatt-hours
of energy per hour of use. The system does
not have a thermostat. It achieves
maximum temperature after
approximately three hours of operation.
Using the heater longer than three hours
does not improve system performance and
unnecessarily uses electricity.
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Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Starting and Stopping the Engine

5. Operate the fuel pump nozzle within
the area shown. 6.
When you finish refueling slightly raise
the fuel pump nozzle and slowly
remove it.
7. Fully close the fuel filler door.
Do not attempt to start the engine if you
have filled the fuel tank with incorrect fuel.
Incorrect fuel use could cause damage not
covered by the vehicle Warranty. Have your
vehicle immediately checked.
Refueling System Warning (If Equipped)
If the fuel tank filler valve does not fully
close, a message could appear in the
information display. Message
Check Fuel Fill Inlet
If the message appears, do the following:
1. Stop your vehicle as soon as it is safe to do so and switch the engine off.
2. Shift into park (P) or neutral (N). 3. Apply the parking brake.
4. Fully open the fuel filler door.
5. Check the fuel tank filler valve for any
debris that may be restricting its
movement.
6. Remove any debris from the fuel tank filler valve.
7. Fully insert a fuel pump nozzle or the fuel filler funnel provided with your
vehicle into the fuel filler pipe. See
Fuel Filler Funnel Location (page
154). This action should dislodge any
debris that may be preventing the fuel
tank filler valve from fully closing.
8. Remove the fuel pump nozzle or fuel filler funnel from the fuel filler pipe.
9. Fully close the fuel filler door.
Note: The message may not immediately
reset. If the message continues to appear
and a warning lamp illuminates, have your
vehicle checked as soon as possible.
FUEL CONSUMPTION
Advertised Capacity
The advertised capacity is the maximum
amount of fuel that you can add to the fuel
tank after running out of fuel. Included in
the advertised capacity is an empty
reserve. The empty reserve is an
unspecified amount of fuel that remains
in the fuel tank when the fuel gauge
indicates empty.
Note: The amount of fuel in the empty
reserve varies and should not be relied upon
to increase driving range.
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Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Fuel and RefuelingE206912 E119081

Filling the Fuel Tank
For consistent results when refueling:
•
Switch the ignition off before fueling,
an inaccurate reading results if you
leave the engine running.
• Use the same fill rate,
low-medium-high, each time you fill
the tank.
• Allow no more than one automatic
shut-off when refueling.
Results are most accurate when the filling
method is consistent.
Calculating Fuel Economy
Your vehicle calculates fuel economy
figures through the trip computer average
fuel function. See Information Displays
(page 99).
The first
1,000 mi (1,600 km) of driving is
the break-in period of the engine. The
system obtains a more accurate
measurement after
2,000– 3,000 mi
(3,200–4,800 km).
Keep a record for at least one month and
record the type of driving, for example city
or highway. This provides an accurate
estimate of your vehicle ’s fuel economy
under current driving conditions. Keeping
records during summer and winter shows
how temperature impacts fuel economy.
Conditions Affecting Fuel Efficiency
• Carrying unnecessary weight in your
vehicle may reduce fuel economy.
• Avoid adding accessories that increase
aerodynamic drag to your vehicle such
as bug deflectors, car top carriers and
ski or bike racks.
• Remove empty roof racks and keep
windows shut at high speeds to reduce
wind resistance and fuel use. •
Check and adjust tire pressure
regularly. Underinflated tires increases
fuel consumption.
• Sudden acceleration and braking
degrade fuel efficiency. Drive smoothly
looking as far ahead as possible and
avoid short trips when possible.
• Fuel efficiency degrades with lower
temperatures.
• Comfort features use additional energy
and consume more fuel. Use AC and
other comfort features only when
necessary.
• Using fuel blended with alcohol may
increase fuel consumption.
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Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Fuel and Refueling

EMISSION LAW
WARNING: Do not remove or alter
the original equipment floor covering or
insulation between it and the metal floor
of the vehicle. The floor covering and
insulation protect occupants of the
vehicle from the engine and exhaust
system heat and noise. On vehicles with
no original equipment floor covering
insulation, do not carry passengers in a
manner that permits prolonged skin
contact with the metal floor. Failure to
follow these instructions may result in
fire or personal injury.
U.S. federal laws and certain state laws
prohibit removing or rendering inoperative
emission control system components.
Similar federal or provincial laws may
apply in Canada. We do not approve of any
vehicle modification without first
determining applicable laws. Tampering with emissions
control systems including
related sensors can result in
reduced engine power and the illumination
of the service engine soon light.
Tampering With a Noise Control
System
Federal laws prohibit the following acts:
• Removal or rendering inoperative by
any person other than for purposes of
maintenance.
• Repair or replacement of any device or
element of the design incorporated into
a new vehicle for the purpose of noise
control prior to its sale or delivery to
the ultimate purchaser or while it is in
use.
• The use of the vehicle after any person
removes or renders inoperative any
device or element of the design. The U.S. Environmental Protection Agency
may presume to constitute tampering as
follows:
•
Removal of hood blanket, fender apron
absorbers, fender apron barriers,
underbody noise shields or acoustically
absorptive material.
• Tampering or rendering inoperative the
engine speed governor, to allow engine
speed to exceed manufacturer
specifications.
If the engine does not start, runs rough,
experiences a decrease in engine
performance, experiences excess fuel
consumption or produces excessive
exhaust smoke, check for the following:
• A plugged or disconnected air inlet
system hose.
• A plugged engine air filter element.
• A clogged fuel filter.
• Contaminated fuel.
• Air in the fuel system, due to loose
connections.
• Fuel system leaks, due to loose
connections.
• An open or pinched sensor hose.
• Incorrect engine oil level.
• Incorrect fuel for climatic conditions.
• Incorrect engine oil viscosity for
climactic conditions.
Note: Some vehicles have a lifetime fuel
filter that is integrated with the fuel tank.
Regular maintenance or replacement is not
needed.
Note: If these checks do not help you
correct the concern, see your authorized
dealer as soon as possible.
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Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-09-2020, enUSA, Edition date: 202010, Second-Printing Engine Emission Control