2023 HYUNDAI SONATA HYBRID Owners Manual

Maintenance
8-4
You should exercise the utmost care
to prevent damage to your vehicle and
injury to yourself whenever performing
any maintenance or inspection
procedures.
Have your vehicle maintained and
repaired by an authorized HYUNDAI
dealer. An authorized HYUNDAI dealer
meets HYUNDAI’s high service quality
standards and receives technical support
from HYUNDAI in order to provide you
with a high level of service satisfaction.
Owner’s Responsibility
Maintenance service and record
retention are the owner’s responsibility.
You should retain documents that show
proper maintenance has been performed
on your vehicle in accordance with
the scheduled maintenance service
charts shown on the following pages.
You need this information to establish
your compliance with the servicing
and maintenance requirements of your
vehicle warranties.
Detailed warranty information is
provided in your Owner’s Handbook &
Warranty Information booklet.
Repairs and adjustments required as a
result of improper maintenance or a lack
of required maintenance are not covered.
Owner Maintenance Precautions
Inadequate, incomplete or insufficient
servicing may result in operational
problems with your vehicle that could
lead to vehicle damage, an accident, or
personal injury. This chapter provides
instructions only for the maintenance
items that are easy to perform. Several
procedures can be done only by an
authorized HYUNDAI dealer with special
tools.
Your vehicle should not be modified
in any way. Such modifications may
adversely affect the performance, safety
or durability of your vehicle and may, in
addition, violate conditions of the limited
warranties covering the vehicle.
Certain modifications may also be in
violation of regulations established by
the U.S. Department of Transportation
and other federal or state agencies.
NOTICE
Improper owner maintenance during
the warranty period may affect
warranty coverage. For details, read
the separate Owner’s Handbook &
Warranty Information booklet provided
with the vehicle. If you’re unsure about
any service or maintenance procedure,
have it done by an authorized HYUNDAI
dealer.
MAINTENANCE SERVICES

08
8-5
WARNING
Performing maintenance work on a
vehicle can be dangerous. If you lack
sufficient knowledge and experience or
the proper tools and equipment to do
the work, have it done by an authorized
HYUNDAI dealer.
ALWAYS follow these precautions for
performing maintenance work:
• Park your vehicle on level ground,
shift the gear to P (Park), apply
the parking brake, and press the
Engine Start/Stop button to the OFF
position.
• Block the tires (front and back) to
prevent the vehicle from moving.
Remove loose clothing or jewelry
that can become entangled in
moving parts.
• If you must run the engine during
maintenance, do so in an outdoor
area or in an area with plenty of
ventilation.
• Keep flames, sparks, or smoking
materials away from the battery and
fuel-related parts.The following lists are vehicle checks and
inspections that should be performed
by the owner or an authorized HYUNDAI
dealer at the frequencies indicated to
help ensure safe, dependable operation
of your vehicle.
Any adverse conditions should be
brought to the attention of your dealer as
soon as possible.
These Owner Maintenance vehicle
checks are generally not covered by
warranties and you may be charged for
labor, parts and lubricants used.
Owner Maintenance Schedule
When you stop for fuel:
• Check the coolant level in the engine
coolant reservoir.
• Check the windshield washer fluid
level.
• Check for low or under-inflated tires.
WARNING
Be careful when checking your engine
coolant/inverter coolant level when the
engine is hot. This may result in coolant
being blown out of the opening and
cause serious burns and other injuries.
OWNER MAINTENANCE

Maintenance
8-6
While operating your vehicle:
• Note any changes in the sound of the
exhaust or any smell of exhaust fumes
in the vehicle.
• Check for vibrations in the steering
wheel. Notice if there is any increased
steering effort or looseness in the
steering wheel, or change in its
straight-ahead position.
• Notice if your vehicle constantly turns
slightly or “pulls” to one side when
traveling on smooth, level road.
• When stopping, listen and check for
unusual sounds, pulling to one side,
increased brake pedal travel or “hard-
to-push” brake pedal.
• If any slipping or changes in the
operation of your transmission occurs,
check the transmission fluid level.
• Check the automatic transmission P
(Park) function.
• Check the parking brake.
• Check for fluid leaks under your
vehicle (water dripping from the air
conditioning system during or after
use is normal).
At least monthly:
• Check coolant level in the engine
coolant reservoir.
• Check the operation of all exterior
lights, including the stoplights, turn
signals and hazard warning flashers.
• Check the inflation pressures of all
tires including the spare for tires that
are worn, show uneven wear, or are
damaged.
• Check for loose wheel lug nuts.
At least twice a year: (for example,
every Spring and Autumn)
• Check radiator, heater and air
conditioning hoses for leaks or
damage.
• Check windshield washer spray and
wiper operation. Clean wiper blades
with a clean cloth dampened with
washer fluid.
• Check headlight alignment.
• Check muffler, exhaust pipes, shields
and clamps.
• Check the seat belts for wear and
function.
At least once a year:
• Clean body and door drain holes.
• Lubricate door hinges and hood
hinges.
• Lubricate door and hood locks and
latches.
• Lubricate door rubber weather strips.
• Check the air conditioning system.
• Inspect and lubricate automatic
transmission linkage and controls.
• Clean the battery and terminals.
• Check the brake fluid level.

08
8 -7
Follow Normal Maintenance Schedule if the vehicle is usually operated where none of
the following conditions apply. If any of the following conditions apply, you must follow
the Maintenance Under Severe Usage Conditions.
• Repeatedly driving short distance of less than 5 miles (8 km) in normal temperature
of less than 10 miles (16 km) in freezing temperature.
• Extensive engine idling or low speed driving for long distances.
• Driving on rough, dusty, muddy, unpaved, graveled or salt-spread roads.
• Driving in areas using salt or other corrosive materials or in very cold weather.
• Driving in heavy dust condition.
• Driving in heavy traffic area.
• Driving on uphill, downhill, or mountain roads repeatedly.
• Using for towing or camping, and driving with loads on the roof
• Driving as a patrol car, taxi, other commercial use of vehicle towing.
• Frequently driving under high speed or rapid acceleration/deceleration.
• Frequently driving in stop-and-go conditions.
• Engine oil usage which is not recommended(Mineral type, Semi-synthetic, Lower
grade spec, etc.)
If your vehicle is operated under the above conditions, you should inspect, replace
or refill more frequently than the following Normal Maintenance Schedule. After the
periods or distance shown in the chart, continue to follow the prescribed maintenance
intervals.
Information
After driving more than 10 years or 100,000 miles, use severe maintenance schedule.
Information
• As it is normal for engine oil to be consumed during driving, the engine oil level should
be checked on regular basis.
• The engine oil change interval for normal operating conditions is based on the use of
the recommended engine specification. If the recommended engine oil specification
is not used, then replace the engine oil according to the maintenance schedule under
severe operating conditions.
SCHEDULED MAINTENANCE SERVICES

Maintenance
8-8
Normal Maintenance ScheduleThe following maintenance services must be performed to ensure good emission control and performance.
Keep receipts for all vehicle emission services to protect your warranty. Where both mileage and time are shown, the frequency of
service is determined by whichever occurs first.
MAINTENANCE

INTERVALS
MAINTENANCE
ITEM Number of months or driving distance, whichever comes first
Months 1224 3648 60 7284 96108 120 132144 156168 180
Milesx1,000 816 24 3240 48 5664 7280 8896104 112120
Kmx1,000 1326 39 5265 78 91104 117130 143156169 182195
HSG belts
*1
Inspect every 8,000 miles (13,000 km) or 12 months, and replace every 64,000 miles
(104,000 km) or 48 months
Engine oil and engine oil filter
*2
R RRRRRRRRRRRRRR
Fuel additives
*3
Add fuel additives every 8,000 miles (13,000 km) or 12 months
Air cleaner filter IIR IIR IIR IIR IIR
Spark plugs Replace every 100,000miles
Rotate Tires (includes tread wear inspection
and tire pressure check) Rotate tires every 8,000 miles (13,000 km) or 12 months
Climate control air filter RRRRRRR
Engine coolant / Inverter coolant At first, replace at 120,000 miles (200,000 km) or 120 months.
After that, replace every 24,000 miles (39,000 km) or 24 months
I : Inspect and if necessary, adjust, correct, clean or replace.
R : Replace or change.*1 : The drive belt should be replaced when cracks occur or tension is reduced excessively.
*2 : Requires API SN PLUS (or above) grade engine oil. If a lower grade engine oil is used, then the engine oil and engine oil filter
must be replaced at every 5,000 miles (8,000 km) or 6 months as indicated for severe maintenance condition.
*3 : If TOP TIER Detergent Gasoline is not available, one bottle of additive is recommended. Additives are available from your
authorized HYUNDAI dealer along with information on how to use them. Do not mix other additives.

08
8-9
Normal Maintenance Schedule (CONT.)
MAINTENANCE

INTERVALS
MAINTENANCE
ITEM Number of months or driving distance, whichever comes first
Months 1224 3648 60 7284 96108 120 132144 156168 180
Milesx1,000 816 24 3240 48 5664 7280 8896104 112120
Kmx1,000 1326 39 5265 78 91104 117130 143156169 182195
Battery condition IIIIIIIIIIIIIII
Brake lines, hoses and connections IIIIIIIIIIIIIII
Brake hoses and lines IIIIIIIIIIIIIII
Disc brakes and pads IIIIIIIIIIIIIII
Steering gear rack, linkage and boots IIIIIIIIIIIIIIIDriveshaft and boots IIIIIII
Suspension mounting bolts IIIIIIIIIIIIIII
Air conditioner refrigerant IIIIIIIIIIIIIII
Air conditioner compressor IIIIIIIIIIIIIII
Exhaust pipe and muffler IIIIIII
Automatic transmission fluid No check, No service required
Vapor hose, fuel filler cap and fuel tank IIII : Inspect and if necessary, adjust, correct, clean or replace.
R : Replace or change.

Maintenance
8-10
Normal Maintenance Schedule (CONT.)
MAINTENANCE

INTERVALS
MAINTENANCE
ITEM Number of months or driving distance, whichever comes first
Months 1224 3648 60 7284 96108 120 132144 156168 180
Milesx1,000 816 24 3240 48 5664 7280 8896104 112120
Kmx1,000 1326 39 5265 78 91104 117130 143156169 182195
Fuel tank air filter
*4
I IIIIII
Fuel filter
*4
I IIIIII
Fuel lines, hoses and connections IIIIIII
Parking brake IIIIIII
Brake fluid Inspect every 8,000 miles (13,000 km) or 12 months,
Replace every 48,000 miles (78,000 km) or 48 months
I : Inspect and if necessary, adjust, correct, clean or replace.
R : Replace or change.*4 : Fuel filter & Fuel tank air filter are considered to be maintenance free but periodic inspection is recommended for this
maintenance schedule depends on fuel quality. If there are some important safety matters like fuel flow restriction, surging, loss
of power, hard starting problem, etc., replace the fuel filter immediately regardless of maintenance schedule and consult an
authorized HYUNDAI dealer for details.

08
8-11
Maintenance Under Severe Usage Conditions
The following items must be serviced more frequently on cars normally used under severe
driving conditions. Refer to the chart below for the appropriate maintenance intervals.
R : Replace
I : Inspect and, after inspection, clean, adjust, repair or replace if necessary
Maintenance ItemMaintenance
operation Maintenance Intervals Driving
condition
HSG (Hybrid Starter &
Generator) belt R
Every 30,000 miles (48,000 km)
or 24 months B, C, D, E, I, K
I Every 5,000 miles (8,000 km) or
6 months
Engine oil and filter
*1R Every 5,000 miles (8,000 km) or
6 months A, B, C, D, E,
F, G, H, I, J, K, L
Air cleaner filter RMore frequently C, E
Spark plugs RMore frequently A, B, F, G, H,
I, K
Climate control air filter
(for evaporator and
blower unit) R
More frequently C, E, G
Front brake disc/pads,
calipers I
More frequently C, D, G, H
Rear brake disc/pads IMore frequently C, D, G, F
Steering gear box,
linkage & boots/ lower
arm ball joint, upper arm
ball joint I
More frequently C, D, E, F, G,
H, I
Drive shafts and boots IInspect more frequently
depending on the condition C, D, E, F,
G, H, I, J
Automatic transmission
fluid R
Every 60,000 miles (96,000 km) A, C, D, E, F,

G, H, I, K
Parking brake IMore frequently C, D, G, H
*1 : Requires grade engine oil. If a lower grade
engine oil (mineral oil including Semi-synthetic) is used, then the engine oil and engine
oil filter must be replaced as indicated for severe maintenance condition.