service LEXUS UX250H 2019 Owner's Guide

4007-2. Steps to take in an emergency
One of the following may be the cause
of the problem:
The electronic key may not be func-
tioning properly. ( P.403)
 There may not be sufficient fuel in
the vehicle’s tank.
Refuel the vehicle. ( P.190)
 There may be a malfunction in the
immobilizer system. ( P.69)
 There may be a malfunction in the
steering lock system.
 The hybrid system may be malfunc-
tioning due to an electrical problem
such as electronic key battery
depletion or a blown fuse. However,
depending on the type of malfunc-
tion, an interim measure is available
to start the hybrid system.
One of the following may be the cause
NOTICE
■When replacing the tires
When removing or fitting the wheels,
tires or the tire pressure warning valve
and transmitter, contact your Lexus
dealer as the tire pr essure warning valve
and transmitter may be damaged if not
handled correctly.
■When driving over bumps
If a vehicle has a flat tire, the vehicle
height will be lower than usual. Ensure
that nothing strikes the bottom of the
vehicle.
■To avoid damaging the tire pressure
warning valves and transmitters
When a tire is repaired with liquid seal-
ants, the tire pressure warning valve and
transmitter may not operate properly. If a
liquid sealant is used , contact your Lexus
dealer or other qualified service shop as
soon as possible. Make sure to replace
the tire pressure warning valve and trans-
mitter when replacing the tire. ( P.350)
If the hybrid system will not
s
tart
Reasons for the hybrid system not
starting vary depending on the situ-
ation. Check the following and per-
form the appropriate procedure:
The hybrid system will not start
even though the correct starting
procedure is being followed.
(  P.162)
The interior lights and head-
lights are dim, or the horn does
not sound or sounds at a low vol-
ume.

4027-2. Steps to take in an emergency
1Remove the cover inside the lug-
gage compartment by inserting a
screwdriver.
When removing the cover, to prevent dam-
age, cover the tip of the screwdriver with a
rag.
2Pull the lever.
Using the lever to open the fuel filler
door may not allow for an adequate
If you lose your keys
New genuine mechanical keys can
be made by your Lexus dealer using
another mechanical key and the
key number stamped on your key
number plate. Keep the plate in a
safe place such as your wallet, not in
the vehicle.
NOTICE
■When an electronic key is lost
If the electronic key remains lost, the risk
of vehicle theft increases significantly.
Visit your Lexus deal er immediately with
all remaining electronic keys and the
card key (if equipped) that were pro-
vided with your vehicle.
If the fuel filler door cannot
b
e opened
If the fuel filler door opener switch
cannot be operated, contact your
Lexus dealer to service the vehicle.
In case where refueling is urgently
necessary, the following procedure
can be used to open the fuel filler
door.
Opening the fuel filler door

4238-1. Specifications
8
Vehicle specifications
■Gasoline quality
In very few cases, driveability problems may
be caused by the brand of gasoline you are
using. If driveability problems persist, try
changing the brand of gasoline. If this does
not correct the problem, consult your Lexus
dealer.
■Recommendation of the use of gasoline
containing detergent additives
●Lexus recommends the use of gasoline
that contains detergent additives to avoid
the build-up of engine deposits.
●All gasoline sold in the U.S.A. contains
minimum detergent additives to clean
and/or keep clean intake systems, per
EPA’s lowest additive s concentration pro-
gram.
●Lexus strongly recommends the use of
Top Tier Detergent Gasoline. For more
information on Top Tier Detergent Gaso-
line and a list of marketers, please go to
the official websit e www.toptiergas.com.
■Recommendation of the use of low
emissions gasoline
Gasolines containing oxygenates such as
ethers and ethanol, as well as reformulated
gasolines, are available in some cities.
These fuels are typically acceptable for use,
providing they meet other fuel require-
ments. Lexus recommends these fuels, since the
formulations allow for reduced vehicle
emissions.
■Non-recommendation of the use of
blended gasoline
●Use only gasoline containing up to 15%
ethanol.
DO NOT use any flex-fuel or gasoline
that could contain more than 15% etha-
nol, including from
any pump labeled
E30 (30% ethanol ), E50 (50% eth-
anol ), E85 (85% ethanol )
(which are only some examples of fuel
containing more than 15% ethanol).
●If you use gasohol in your vehicle, be sure
that it has an octane rating no lower than
87.
●Lexus does not recommend the use of
gasoline containing methanol.
■Non-recommendation of the use of gas-
oline containing MMT
Some gasoline contains an octane enhanc-
ing additive called MMT (Methylcyclopen-
tadienyl Manganese Tricarbonyl).
Lexus does not recommend the use of gas-
oline that contains MMT. If fuel containing
MMT is used, your emission control system
may be adversely affected.
The malfunction indicator lamp on the
instrument cluster may come on. If this hap-
pens, contact your Lexus dealer for service.
■If your engine knocks
●Consult your Lexus dealer.
●You may occasionally notice light knock-
ing for a short time wh ile accelerating or
driving uphill. This is normal and there is
no need for concern.
Fuel information
You must only use unleaded gaso-
line.
Select octane rating 87 (Research
Octane Number 91) or higher. Use
of unleaded gasoline with an octane
rating lower than 87 may result in
engine knocking. Persistent knock-
ing can lead to engine damage.
At minimum, the gasoline you use
should meet the specifications of
ASTM D4814 in the U.S.A.
A
BC

4288-1. Specifications
information.
■DOT quality grades
All passenger vehicle tires must con-
form to Federal Safety Requirements in
addition to these grades. Quality
grades can be found where applicable
on the tire sidewall between tread
shoulder and maximum section width.
For example: Treadwear 200 Traction AA
Temperature A
■Treadwear
The treadwear grade is a comparative
rating based on the wear rate of the tire
when tested under controlled condi-
tions on a specified government test
course.
For example, a tire graded 150 would wear
one and a half (1 - 1/2) times as well on the
government course as a tire graded 100.
The relative performa nce of tires depends
upon the actual conditions of their use,
however, and may depart significantly from
the norm due to variatio ns in driving habits,
service practices and differences in road
characteristics and climate.
■Traction AA, A, B, C
The traction grades, from highest to
lowest, are AA, A, B and C, and they
represent the tire’s ability to stop on
wet pavement as measured under con-
trolled conditions on specified govern-
ment test surfaces of asphalt and
concrete.
A tire marked C may have poor traction
performance.
Warning: The traction grade assigned to
this tire is based on braking (straight
ahead) traction tests and does not include
cornering (turning) traction.
■Temperature A, B, C
The temperature grades are A (the
highest), B, and C, representing the
tire’s resistance to the generation of
heat and its ability to dissipate heat
when tested under controlled condi-
tions on a specified indoor laboratory
test wheel.
Sustained high temperature can cause the
material of the tire to degenerate and
reduce tire life, and excessive temperature
can lead to sudd en tire failure.
Grade C corresponds to a level of perfor-
mance which all passenger car tires must
meet under the Fede ral Motor Vehicle
Safety Standard No. 109.
Grades B and A represent higher levels of
performance on the laboratory test wheel
than the minimum required by law.
Warning: The temperature grades for this
tire are established for a tire that is prop-
erly inflated and not overloaded.
Excessive speed, unde rinflation, or exces-
sive loading, either separately or in combi-
nation, can cause heat buildup and
possible tire failure.

Alphabetical Index471
Rev indicator .................................................... 84
Rev peak............................................................. 84
Road Sign Assist ............................................ 214
RSA (Road Sign Assist) .............................. 214
Run-flat tires........................................ 347, 399
S
Seat belt reminder light................... 390, 391
Seat belts............................................................ 26 Adjusting the seat belt shoulder anchor height............................................................... 29
Automatic Locking Retractor ................ 28
Child restraint system installation ......... 44
Cleaning and maintaining the seat belt ......................................................................... 325
Emergency Locking Retractor .............. 28
How to wear your seat belt ......................27
How your child should wear the seat belt ............................................................................ 28
Pregnant women, proper seat belt use .............................................................................27
Reminder light and buzzer ........ 390, 391
Seat belt extender ........................................ 28
Seat belt pretensioners .............................. 29
SRS warning light ..................................... 388
Seat heaters .................... ............................... 286
Seating capacity............................................ 160
Seat position memory..................................133
Seats........................................................... 131, 132 Adjustment precautions ............................ 131
Adjustment....................................................... 131
Child seats/child restraint system installa-tion .................................................................... 44
Cleaning......................................................... 325
Driving position memory.........................133
Head restraint................................................136
Power easy access system .....................133
Properly sitting in the seat ........................ 25
Seat heaters .................................................. 287
Seat position memory ...............................133
Seat ventilators............................................ 287
Seat ventilators ............................................. 286 Secondary Collision Brake ..................... 257
Sensor
Automatic headlight system ................... 177
Automatic High Beam system .............180
Inside rear view mirror ............................... 141
Intuitive parking assist .............................. 232
LTA (Lane Tracing Assist) ................... 205
Parking Support Brake function (rear-crossing vehicles)................................... 252
Parking Support Brake function (static objects) ........................................................248
Radar sensor ...................................... 192, 227
Rain-sensing windshield wipers .......... 186
RCTA...............................................................240
Service plug ...................................................... 65
Service reminder message ..................... 328
Shift lever Hybrid transmission................................... 168
Side airbags ........................................................31
Side doors........................................................ 108
Side marker lights Light switch ..................................................... 177
Side mirrors ..................................................... 142 Adjustment ......................................................142
BSM (Blind Spot Monitor).................... 226
Folding...............................................................143
Linked mirror functi on when reversing
............................................................................143
Mirror position memory .......................... 133
RCTA function ............................................239
Side turn signal lights Replacing light bulbs ................................ 374
Turn signal lever ............................................ 171
Side windows ..................................................145
Smart access system with push-button start................................................................... 124Antenna location ..........................................124
Entry functions ..................................... 108, 113
Starting the hybrid system .......................162
Snow tires ....................................................... 263
Spark plug ...................................................... 420
Specifications ..................................................416