2018 MAZDA MODEL 3 HATCHBACK check engine

▼Emission Control System
This vehicle is equipped with an
emission control system (the catalytic converter is part of
this system) that enables the vehicle to comply with existing e xhaust emissions
requirements.
WA R N I N G
Never park over or near anything flammable:
Parking over or near anything flammable, such as dry grass, is dangerous. Even with the
engine turned off, the exhaust system remains very hot after normal use and could ignite
anything flammable. A resulting fire co uld cause serious injury or death.
CAUTION
Ignoring the following precautions could cause lead to accumulate on the catalyst inside the
converter or cause the converter to get very hot. Either condition will damage the converter
and cause poor performance.
USE ONLY UNLEADED FUEL.
 Do not drive your Mazda with any sign of engine malfunction.
 Do not coast with the ignition switched off.
 Do not descend steep grades in gear with the ignition switched off.
 Do not operate the engine at high idle for more than 2 minutes.
 Do not tamper with the emission control sy stem. All inspections and adjustments must be
made by a qualified technician.
 Do not push-start or pull-start this vehicle.
NOTE
Under U.S. federal law, any modification to the original-equipment emission control
system before the first sale and registration of a vehicle is subject to penalties. In some
states, such modification made on a used vehicle is also subject to penalties.
While the engine is off, the sound of a valve opening and closing can be heard at the rear
of the vehicle, however this does not indicate an abnormality. The vehicle has a
self-checking device and it oper ates while the engine is off.
Before Driving
Fuel and Emission
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Fuel-Filler Lid and Cap
WA R N I N G
When removing the fuel-filler cap, loosen
the cap slightly and wait for any hissing to
stop, then remove it:
Fuel spray is dangerous. Fuel can burn skin
and eyes and cause illness if ingested. Fuel
spray is released when there is pressure in
the fuel tank and the fuel-filler cap is
removed too quickly.
Before refueling, stop the engine, and
always keep sparks and flames away from
the filler neck:
Fuel vapor is dangerous. It could be ignited
by sparks or flames causing serious burns
and injuries.
Additionally, use of the incorrect fuel-filler
cap or not using a fuel-filler cap may result
in a fuel leak, which could result in serious
burns or death in an accident.
Do not continue refueling after the fuel
pump nozzle shuts off automatically:
Continuing to add fuel after the fuel pump
nozzle has shut off automatically is
dangerous because overfilling the fuel tank
may cause fuel overflow or leakage. Fuel
overflow and leakage could damage the
vehicle and if the fuel ignites it could cause
a fire and explosion resulting in serious
injury or death.
CAUTION
(U.S.A. and Canada)
Always use only a genuine Mazda fuel-filler
cap or an approved eq uivalent, available at
an Authorized Mazda Dealer. The wrong
cap can result in a serious malfunction of
the fuel and emission control systems. It
may also cause the check engine light in
the instrument cluster to illuminate.
▼ Fuel-Filler Lid
To open, pull the re
mote fuel-filler lid
release.
To close, press the fuel-filler lid until it
locks securely.
Remote fuel-filler
lid release
Before Driving
Fuel and Emission
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▼Fuel-Filler Cap
To remove the fuel-filler cap, turn it
counterclockwise.
Attach the removed cap to the inner side
of the fuel lid.

To close the fuel-filler cap, turn it
clockwise until a click is heard.

Open
Close
CAUTION
(U.S.A. and Canada)
If the check fuel cap warning light
illuminates, the fuel-filler cap may not be
properly installed. If the warning light
illuminates, park your vehicle safely off the
right-of-way, remove the fuel-filler cap and
reinstall it correctly. After the cap has been
correctly installed, the fuel cap warning
light may continue to illuminate until a
number of driving cycles have been
completed. A drive cycle consists of starting
the engine (after four or more hours with
the engine off) and driving the vehicle on
city and highway roads.
Continuing to drive with the check fuel cap
warning light illuminated could cause the
check engine light to illuminate as well.
Before Driving
Fuel and Emission
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NOTE
The keys carry a unique electronic code.
For this reason, and to assure your
safety, obtaining a replacement key
requires some waiting time. They are
only available through an Authorized
Mazda Dealer.
Always keep a spare key in case one is
lost. If a key is lost, consult an
Authorized Mazda Dealer as soon as
possible.
If you lose a key, an Authorized Mazda
Dealer will reset the electronic codes of
your remaining keys and immobilizer
system. Bring all the remaining keys to
an Authorized Mazda Dealer to reset.
Starting the vehicle with a key that has
not been reset is not possible.
▼Operation
NOTE
The engine may not start and security
indicator light may illuminate or flash if
the key is placed in an area where it is
difficult for the system to detect the
signal, such as on the dashboard or in
the glove compartment. Move the key to
a location within
the signal range,
switch the ignition off, and then restart
the engine.
Signals from a TV or radio station, or
from a transceiver or mobile telephone
could interfere with your immobilizer
system. If you are using the proper key
and the engine fails to start, check the
security indicator light.
Arming
The system is armed when the ignition is
switched from ON to off.
The security indicator light in the
instrument cluster fla shes every 2 seconds
until the system is disarmed.

Disarming
The system is disarmed when the ignition
is switched ON with the correct
programmed key. The security indicator
light illuminates for about 3 seconds and
then turns off. If the engine does not start
with the correct key, and the security
indicator light remains illuminated or
flashing, try the following:
Make sure the key is within the
operational range for signal transmission.
Switch the ignition off, and then restart the
engine. If the engine d oes not start after 3
or more tries, contact an Authorized
Mazda Dealer.
NOTE
If the security indicator light flashes
continuously while you are driving, do
not shut off the engine. Go to an
Authorized Mazda Dealer and have it
checked. If the engine is shut off while
the indicator light is flashing, you will
not be able to restart it.
Because the electronic codes are reset
when the immobilizer system is repaired,
the keys are needed. Make sure to bring
all the keys to an Authorized Mazda
Dealer so that they can be programmed.
Before Driving
Security System
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Winter Driving
Carry emergency gear, including tire
chains, window scraper, flares, a small
shovel, jumper cables, and a small bag of
sand or salt.
Ask an Authorized Mazda Dealer to check
the following:
Have the proper ratio of antifreeze in the
radiator.
Refer to Engine Coolant on page 6-25.
Inspect the battery and its cables. Cold
reduces battery capacity.
Use an engine oil appropriate for the
lowest ambient temperatures that the
vehicle will be driven in (page 6-23).
Inspect the ignition system for damage
and loose connections.
Use washer fluid made with
antifreeze―but do not use engine
coolant antifreeze for washer fluid (page
6-27).
NOTE
(Without electric parking brake (EPB))
Do not use the parking brake in freezing
weather as it may freeze. Instead, shift
to P with an automatic transaxle and to
1 or R with a manual transaxle. Block
the rear wheels.
Remove snow before driving. Snow left
on the windshield is dangerous as it
could obstruct vision.
Do not apply excessive force to a
window scraper when removing ice or
frozen snow on the mirror glass and
windshield.
Never use warm or hot water for
removing snow or ice from windows and
mirrors as it could result in the glass
cracking.
Drive slowly. Braking performance can
be adversely affected if snow or ice
adheres to the brake components. If this
situation occurs, drive the vehicle
slowly, releasing the accelerator pedal
and lightly applying the brakes several
times until the brake performance
returns to normal.
▼ Snow Tires
Use snow tires on all four wheels
Do not go faster than 120 km/h (75 mph)
while driving with sno
w tires. Inflate snow
tires 30 kPa (0.3 kgf/cm
2, 4.3 psi) more
than recommended on the tire pressure
label (driver's door frame), but never more
than the maximum c old-tire pressure
shown on the tires.

Except Mexico (18–inch wheel vehicle)
The vehicle is originally equipped with all
season radials designed to be used all year
around. In some extreme climates you
may find it necessary t o replace them with
snow tires during the winter months to
further improve traction on snow and ice
covered roads.
Mexico (18–inch wheel vehicle)
The vehicle is originally equipped with
summer tires designed for optimum
traction on wet and dry roads. If your
vehicle is to be used on snow and ice
covered roads, Mazda recommends that
you replace the tires originally equipped
on your vehicle with snow tires during the
winter months.
Before Driving
Driving Tips
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2.(Manual transaxle)
Continue to depress the clutch pedal
firmly until the engine has completely
started.
3. Verify that the push button start
indication light (green) flashes.
4. Touch the push button start using the backside of the key (as shown) while
the push button start indicator light
(green) flashes.

Push b utton start
Transmitter Indicator light
NOTE
When touching the push button start
using the backside of the key as shown
in the illustration, touch the push
button start with the lock switch side of
the key facing up.
5. Verify that the push button start
indicator light (green) turns on.
6. Press the push button start to start the engine.
NOTE
The engine cannot be started unless
the clutch pedal is fully depressed
(manual transaxle) or the brake
pedal is fully depressed (automatic
transaxle).
If there is a malfunction with the
push button start function, the push
button start indicator light (amber)
flashes. In this case, the engine may
start, however, have the vehicle
checked at an Authorized Mazda
Dealer as soon as possible.
If the push button start indicator
light (green) does not illuminate,
perform the operation from the
beginning again. If it does not
illuminate, have the vehicle checked
at an Authorized Mazda Dealer.
To switch the ignition position
without starting the engine, perform
the following operations after the
push button start indicator light
(green) turns on.
1. Release the clutch pedal (manualtransaxle) or brake pedal
(automatic transaxle).
2. Press the push button start to switch the ignition position. The
ignition switches in the order of
ACC, ON, and off each time the
push button start is pressed. To
switch the ignition position
again, perform the operation
from the beginning.
When Driving
Start/Stop Engine
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▼Warning Lights
These lights turn on or flash to notify the user of the system
operation status or a system
malfunction.
Signal Warning Page
Brake System Warning Light*1*27-25
ABS Warning Light*1
Electronic Brake
Force Distribu- tion SystemWa r n i n g 7-25
ABS warning 7-28
Charging System Warning Light*17-25
Engine Oil Warning Light*17-25
(Red) High Engine Coolant Temperature Warning Light
*17-25
Power Steering Malfunction Indicator Light*17-25
Master Warning Light*17-28
*Electric Parking Brake (EPB) Warning Light*17-28
Check Engine Light*17-28
*Automatic Transaxle Warning Light*17-28
Air Bag/Seat Belt Pretensioner System Warning Light*17-28
*Tire Pressure Monitoring System Warning Light*1
Flashing
7-28
Turns on 7-32
(Red) KEY Warning Light
*1
Turns on
7-28
Flashing 7-32
(Amber)
*High Beam Control System (HBC) Warning Light*17-28
When Driving
Instrument Cluster and Display
4-24*Some models.
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SignalWarning Page
(Amber)
*Mazda Radar Cruise Control (MRCC) Warning Light 7-28
*Lane-keep Assist System (LAS) & Lane Departure Warning System
(LDWS) Warning Light*17-28
*LED Headlight Warning Light*17-28
(Amber)
*Smart Brake Support/Smart City B rake Support (SBS/SCBS) Warning
Light*17-32
Low Fuel Warning Light 7-32
Check Fuel Cap Warning Light*17-32
Seat Belt Warning Light 7-32
*Low Washer Fluid Level Warning Light7-32
Door-Ajar Warning Light
7-32
*1 The light turns on when the ignition is switched on for an operation check, and turns off
a few seconds later or when the engine is started. If the light does not turn on or remains
turned on, have the vehicle inspected at an Authorized Mazda De aler.
*2 The light turns on continuously when the parking brake is appl ied.
▼Indicator Lights
These lights turn on or flash to
notify the user of the system operation status or a system
malfunction.
Signal Indicator Lights Page
*Blind Spot Monitoring (BSM) OFF Indicator Light*1
Except malfunc-
tion
4-89
Malfunction 7-28
*Lane-keep Assist System (LAS) & Lane Departure Warning System
(LDWS) OFF Indicator Light*14-116
When Driving
Instrument Cluster and Display
*Some models.4-25
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