2021 HYUNDAI I20 check engine

1-4
Introduction
DANGER
DANGER indicates a hazardous
situation which, if not avoided, will
result in death or serious injury.
WARNING
WARNING indicates a hazardous
situation which, if not avoided, could
result in death or serious injury.
CAUTION
CAUTION indicates a hazardous
situation which, if not avoided, could
result in minor or moderate injury.
NOTICE
NOTICE indicates a situation which,
if not avoided, could result in vehicle
damage.
FUEL REQUIREMENTS
Petrol engine
Unleaded
Your new vehicle is designed to use only
unleaded fuel having an Octane Rating
of RON (Research Octane Number) 91 /
AKI (Anti-Knock Index) 87 or higher. (Do
not use methanol blended fuels)
Your new vehicle is designed to obtain
maximum performance with UNLEADED
FUEL, as well as minimize exhaust
emissions and spark plug fouling.
CAUTION
NEVER USE LEADED FUEL. The use
of leaded fuel is detrimental to the
catalytic converter and will damage the
engine control system’s oxygen sensor
and affect emission control.
Never add any fuel system cleaning
agents to the fuel tank other than what
has been specified (We recommend
that you consult an authorized
HYUNDAI dealer for details.)
WARNING
• Do not “top off” after the nozzle
automatically shuts off when
refueling.
• Always check that the fuel cap is
installed securely to prevent fuel
spillage in the event of an accident.

3-12
Vehicle information
Engine oil viscosity (thickness) has an effect on fuel economy and cold weather
operating (engine start and engine oil flowability). Lower viscosity engine oils can
provide better fuel economy and cold weather performance, however, higher
viscosity engine oils are required for satisfactory lubrication in hot weather.
Using oils of any viscosity other than those recommended could result in engine
damage.
When choosing an oil, consider the range of temperature your vehicle will be
operated in before the next oil change. Proceed to select the recommended oil
viscosity from the chart.
Temperature Range for SAE Viscosity Numbers
Temperature°C
(°F)-30 -20 -10 0 10 20 30 40
-10 0 20 40 60 80 100
0W-20/30
5W-30(Diesel) 1.5 WGT
Temperature Range for SAE Viscosity Numbers
Temperature°C
(°F)-30 -20 -10 0 10 20 30 40 50
-10 0 20 40 60 80 100 120
Petrol
Engine
Oil
0W-20
20W-50
10W-30
15W-40
0W-30, 5W-30, 5W-40
1.0 T-GDi
Smartstream
G1.2 *1
*1 : If mineral oil or semi-synthetic oil is used, it is a severe maintenance condition in
terms of engine oil change.
Recommended SAE viscosity number
CAUTION
Always be sure to clean the area around any filler plug, drain plug, or dipstick
before checking or draining any lubricant. This is especially important in dusty or
sandy areas and when the vehicle is used on unpaved roads. Cleaning the plug
and dipstick areas will prevent dirt and grit from entering the engine and other
mechanisms that could be damaged.
An engine oil displaying this American Petroleum Institute(API)
Certification Mark conforms to the International Lubricant
Specification Advisory Committee (ILSAC). It is recommended to only
use engine oils that uphold this API Certification Mark.

5-10
Instrument cluster
If the brake fluid level in the reser-
voir is low:
1. Drive carefully to the nearest safe
location and stop your vehicle.
2. With the engine stopped, check the
brake fluid level immediately and add
fluid as required (For more details,
refer to “Brake Fluid” in chapter 9).
Then check all brake components for
fluid leaks. If any leak on brake system
is still found, the warning light remains
on, or the brakes do not operate
properly, do not drive the vehicle.
In this case, we recommend that
you have the vehicle towed to an
authorized HYUNDAI dealer and
inspected.
Dual-diagonal braking system
Your vehicle is equipped with dual-
diagonal braking systems. This means
you still have braking on two wheels
even if one of the dual systems should
fail.
With only one of the dual systems
working, more than normal pedal travel
and greater pedal pressure are required
to stop the vehicle.
Also, the vehicle will not stop in as short
a distance with only a portion of the
brake system working.
If the brakes fail while you are driving,
shift to a lower gear for additional
engine braking and stop the vehicle as
soon as it is safe to do so.
WARNING
Parking Brake & Brake Fluid Warning
Light
Driving the vehicle with a warning light
ON is dangerous. If the Parking Brake &
Brake Fluid Warning Light illuminates
with the parking brake released, it
indicates that the brake fluid level is
low.
In this case, we recommend that you
have the vehicle inspected by an
authorized HYUNDAI dealer.
Anti-lock Brake System
(ABS) Warning Light
This warning light illuminates:
• Once you set the ignition switch or
Engine Start/Stop button to the ON
position.
- It illuminates for approximately 3
seconds and then goes off.
• When there is a malfunction with
the ABS (The normal braking system
will still be operational without the
assistance of the anti-lock brake
system).
In this case, we recommend that you
have the vehicle inspected by an
authorized HYUNDAI dealer.

5-12
Instrument cluster
Charging System
Warning Light
This warning light illuminates:
• Once you set the ignition switch or
Engine Start/Stop button to the ON
position.
- It remains on until the engine is
started.
• When there is a malfunction with
either the alternator or electrical
charging system.
If there is a malfunction with either
the alternator or electrical charging
system:
1. Drive carefully to the nearest safe
location and stop your vehicle.
2. Turn the engine off and check the
alternator drive belt for looseness or
breakage.
If the belt is adjusted properly, there
may be a problem in the electrical
charging system.
In this case, we recommend that you
have the vehicle inspected by an
authorized HYUNDAI dealer as soon as
possible.
Engine Oil Pressure
Warning Light
This warning light illuminates:
• Once you set the ignition switch or
Engine Start/Stop button to the ON
position.
- It remains on until the engine is
started.
• When the engine oil pressure is low.
If the engine oil pressure is low:
1. Drive carefully to the nearest safe
location and stop your vehicle.
2. Turn the engine off and check the
engine oil level (For more details, refer
to “Engine Oil” in chapter 9). If the
level is low, add oil as required.
If the warning light remains on after
adding oil or if oil is not available, we
recommend that you have the vehicle
inspected by an authorized HYUNDAI
dealer as soon as possible.

5-13
05
NOTICE
- Engine Oil Pressure Warning Light
• If the engine does not stop
immediately after the Engine Oil
Pressure Warning Light is illuminated,
severe damage could result.
• If the warning light stays on while the
engine is running, it indicates that
there may be serious engine damage
or malfunction. In this case,
1. Stop the vehicle as soon as it is safe
to do so.
2. Turn off the engine and check the
oil level. If the oil level is low, fill
the engine oil to the proper level.
3. Start the engine again. If the
warning light stays on after the
engine is started, turn the engine
off immediately. In this case, we
recommend that you have the
vehicle inspected by an authorized
HYUNDAI dealer.
Low Fuel Level Warning
Light
This warning light illuminates:
When the fuel tank is nearly empty.
If the fuel tank is nearly empty, add fuel
as soon as possible.
NOTICE
- Low Fuel Level
Driving with the Low Fuel Level
warning light on or with the fuel level
below “E (Empty)” can cause the
engine to misfire and damage the
catalytic converter (if equipped).

5-14
Instrument cluster
Fuel Filter Warning Light
(for diesel engine)
This warning light illuminates:
• When water has accumulated inside
the fuel filter.
In this case, remove the water from
the fuel filter.
For more details, refer to “Fuel Filter” in
chapter 9.
NOTICE
• When the Fuel Filter Warning Light
illuminates, engine power (vehicle
speed & idle speed) may decrease.
• If you keep driving with the warning
light on, engine parts (injector,
common rail, high pressure fuel
pump) may be damaged. If this
occurs, we recommend that you
have the vehicle inspected by an
authorized HYUNDAI dealer as soon
as possible.
Exhaust System (DPF)
Warning Light (for diesel
engine, if equipped)
This warning light illuminates:
• When there is a malfunction with the
Diesel Particulate Filter (DPF) system.
When this warning light illuminates, it
may turn off after driving the vehicle:
- at more than 60 km/h (37 mph), or
- above 2nd gear with 1500 ~ 2500
engine rpm for a certain time (for
about 25 minutes).
If this warning light blinks in spite of
the procedure, we recommend that you
have the DPF system checked by an
authorized HYUNDAI dealer.
NOTICE
If you continue to drive with the DPF
warning light blinking for a long time,
the DPF system can be damaged and
fuel consumption can worsen.

5-18
Instrument cluster
Master Warning Light
(if equipped)
This indicator light illuminates :
• When the remaining mileage or time
is 0 on the “Service Interval” in the
cluster.
If the service interval setting is reset,
the master warning light turns off.

KEY OUT Indicator Light
(if equipped)
KEY
OUT
When the Engine Start/Stop button is
in the ACC or ON position, if any door is
open, the system checks for the smart
key.
This indicator light blinks:
When the smart key is not in the vehicle
and any door is open with the ignition
switch or Engine Start/Stop button in the
ACC or ON position.
- At this time, if you close all doors,
the chime will also sound for
approximately 5 seconds.
- The indicator will go off while the
vehicle is moving.
Low Tire Pressure
Warning Light
(if equipped)
This warning light illuminates:
• When you set the ignition switch or
Engine Start/Stop button to the ON
position.
- It illuminates for approximately 3
seconds and then goes off.
• When one or more of your tires
are significantly underinflated (The
location of the underinflated tires are
displayed on the LCD display).
For more details, refer to “Tire Pressure
Monitoring System (TPMS)” section in
chapter 8.
This warning light remains on after
blinking for approximately 60 seconds
or repeatedly blinks on and off at
approximately 3 second intervals:
• When there is a malfunction with the
TPMS.
In this case, we recommend that you
have the vehicle inspected by an
authorized HYUNDAI dealer as soon as
possible.
For more details, refer to “Tire Pressure
Monitoring System (TPMS)” section in
chapter 8.
WARNING
Safe Stopping
• The TPMS cannot alert you to severe
and sudden tire damage caused by
external factors.
• If you notice any vehicle instability,
immediately take your foot off the
accelerator pedal, apply the brakes
gradually with light force, and slowly
move to a safe position off the road.

5-20
Instrument cluster
Shift to N to start engine
(for smart key system and
Automatic transmission/Dual clutch
transmission) / iMT (intelligent
manual transmission))
This warning message is displayed if
you try to start the engine with the shift
button not in the N (Neutral) position.
i Information
You can start the engine with the shift
lever in the N (Neutral) position.
Check BRAKE SWITCH fuse (for
smart key system and Automatic
transmission/Dual clutch
transmission)
This warning message is displayed if the
brake switch fuse is disconnected.
You need to replace the fuse with a new
one. If that is not possible, you can start
the engine by pressing the Engine Start/
Stop button for 10 seconds in the ACC
position.
Lights mode
OIK047163LOIK047163L
This indicator displays which exterior
light is selected using the lighting
control.