2017 Hyundai Sonata Plug-in Hybrid engine

7-3
7
Maintenance
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1. Engine oil filler cap
2. Engine oil dipstick
3. Radiator cap
4. Engine coolant reservoir
5. Brake fluid reservoir
6. Air cleaner
7. Inverter coolant reservoir
8. Windshield washer fluid reservoir
9. Fuse box
The actual engine compartment the vehicle
may differ from the illustration.
OLFH014005K

7-5
7
Maintenance
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The following lists are vehicle checks
and inspections that should be per-
formed by the owner or an author-
ized HYUNDAI dealer at the frequen-
cies indicated to help ensure safe,
dependable operation of your vehi-
cle.
Any adverse conditions should be
brought to the attention of your deal-
er 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.
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 author-
ized HYUNDAI dealer. ALWAYS
follow these precautions for
performing maintenance work:
Park your vehicle on level
ground, move the shift lever
into the P (Park, for automatic
transmission vehicle) posi-
tion, apply the parking brake,
place the Engine Start/Stop
button in the OFF position.
Block the tires (front and back)
to prevent the vehicle from
moving.
Remove loose clothing or jew-
elry that can become entan-
gled in moving parts.
(Continued)
WARNING (Continued)
If you must run the engine
during maintenance, do so
out doors or in an area with
plenty of ventilation.
Keep flames, sparks, or smok-
ing materials away from the
battery and fuel-related parts.
When you open the engine
hood, turn the hybrid system
off. If not, It may result in death
or serious injury because of
the high voltage flow.

7-6
Maintenance
Owner maintenance schedule
When you stop for fuel:
Check the engine oil level.
Check coolant level in the enginecoolant reservoir.
Check the windshield washer fluid level.
Check for low or under-inflated tires.
While operating your vehicle:
Note any changes in the sound ofthe 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 loose-
ness in the steering wheel, or
change in its straight-ahead posi-
tion.
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 enginecoolant 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.
Be careful when checking your
engine 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.
WARNING

Normal maintenance schedule
The 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.
7
Maintenance
7-9
7,500 miles (12,000 km) or 6 months
❑Inspect air cleaner filter
❑ Inspect HSG belt *2
(7,500 miles (12,000 km) or 12 months)
❑ Inspect vacuum hose
❑ Air intake hose
❑ Replace engine oil and filter
(7,500 miles (12,000 km) or 12 months)
❑ Add fuel additive *
1
(7,500 miles (12,000 km) or 12 months)
*1: 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.
*
2: Inspect HSG belt for evidence of cuts, crocks, excessive wear or oil saturation and replace if necessary. If drive belt
noise occurred, readjust drive belt tension before replace.
❈ Inspect : Inspect and if necessary, adjust, correct, clean or
replace.
15,000 miles (24,000 km) or 12 months
❑Inspect air cleaner filter
❑ Inspect HSG belt *2
(15,000 miles (24,000 km) or 24 months)
❑ Inspect vacuum hose
❑ Inspect air conditioning refrigerant
❑ Inspect brake hoses and lines
❑ Inspect drive shafts and boots
❑ Inspect exhaust pipe and muffler
❑ Inspect front brake disc/pads, calipers
❑ Inspect rear brake disc/pads
❑ Inspect steering gear box, linkage & boots/lower arm ball
joint, upper arm ball joint
❑ Inspect suspension mounting bolts
❑ Air intake hose
❑ Replace climate control air filter
(for evaporator and blower unit)
❑ Replace engine oil and filter
(15,000 miles (24,000 km) or 24 months)
(Continued)

Maintenance
7-10
22,500 miles (36,000 km) or 18 months
❑Inspect air cleaner filter
❑ Inspect vacuum hose
❑ Air intake hose
❑ Inspect HSG belt *
2
(22,500 miles (36,000 km) or 36 months)
❑ Replace engine oil and filter
(22,500 miles (36,000 km) or 36 months)
❑ Add fuel additive *
1
(22,500 miles (36,000 km) or 36 months)
Normal maintenance schedule (CONT.)
(Continued)
❑Add fuel additive *1
(15,000 miles (24,000 km) or 24 months)
*
1: 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.
*
2: Inspect HSG belt for evidence of cuts, crocks, excessive wear or oil saturation and replace if necessary. If drive belt
noise occurred, readjust drive belt tension before replace.
❈ Inspect : Inspect and if necessary, adjust, correct, clean or
replace. *
1: 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.
*
2: Inspect HSG belt for evidence of cuts, crocks, excessive wear or oil saturation and replace if necessary. If drive belt
noise occurred, readjust drive belt tension before replace.
❈ Inspect : Inspect and if necessary, adjust, correct, clean or
replace.

7
Maintenance
7-11
Normal maintenance schedule (CONT.)
30,000 miles (48,000 km) or 24 months
❑Inspect vacuum hose
❑ Inspect air conditioning refrigerant
❑ Inspect brake hoses and lines
❑ Inspect drive shafts and boots
❑ Inspect exhaust pipe and muffler
❑ Inspect HSG belt *
2
(30,000 miles (48,000 km) or 48 months)
❑ Inspect front brake disc/pads, calipers
❑ Inspect rear brake disc/pads
❑ Inspect steering gear box, linkage & boots/lower arm ball
joint, upper arm ball joint
❑ Inspect suspension mounting bolts
❑ Inspect brake fluid
❑ Inspect fuel filter *
3
❑Inspect fuel cap, fuel lines, fuel hoses and connections
❑ Inspect fuel tank air filter (if equipped) *3
❑Inspect parking brake
❑ Inspect vapor hose and fuel filler cap
❑ Air intake hose
❑ Replace climate control air filter
(for evaporator and blower unit)
(Continued)
(Continued)
❑Replace air cleaner filter
❑ Replace engine oil and filter
(30,000 miles (48,000 km) or 48 months)
❑ Add fuel additive *
1
(30,000 miles (48,000 km) or 48 months)
*
1: 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.
*
2: Inspect HSG belt for evidence of cuts, crocks, excessive wear or oil saturation and replace if necessary. If drive belt
noise occurred, readjust drive belt tension before replace.
*
3: Fuel filter & Fuel tank air filter are considered to be mainte- nance 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 sched-
ule and consult an authorized HYUNDAI dealer for details.
❈ Inspect : Inspect and if necessary, adjust, correct, clean or
replace.

Maintenance
7-12
Normal maintenance schedule (CONT.)
37,500 miles (60,000 km) or 30 months
❑Inspect air cleaner filter
❑ Inspect HSG belt *2
(37,500 miles (60,000 km) or 60 months)
❑ Inspect vacuum hose
❑ Air intake hose
❑ Replace engine oil and filter
(37,500 miles (60,000 km) or 60 months)
❑ Add fuel additive *
1
(37,500 miles (60,000 km) or 60 months)
45,000 miles (72,000 km) or 36 months
❑ Inspect air cleaner filter
❑ Inspect vacuum hose
❑ Inspect air conditioning refrigerant
❑ Inspect brake hoses and lines
❑ Inspect drive shafts and boots
❑ Inspect exhaust pipe and muffler
❑ Inspect front brake disc/pads, calipers
❑ Inspect HSG belt *
2
(45,000 miles (72,000 km) or 72 months)
❑ Inspect rear brake disc/pads
❑ Inspect steering gear box, linkage & boots/lower arm ball
joint, upper arm ball joint
❑ Inspect suspension mounting bolts
❑ Air intake hoses
❑ Replace climate control air filter
(for evaporator and blower unit)
❑ Replace engine oil and filter
(45,000 miles (72,000 km) or 72 months)
❑ Add fuel additive *
1
(45,000 miles (72,000 km) or 72 months)
*1: 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.
*
2: Inspect HSG belt for evidence of cuts, crocks, excessive wear or oil saturation and replace if necessary. If drive belt
noise occurred, readjust drive belt tension before replace.
❈ Inspect : Inspect and if necessary, adjust, correct, clean or
replace.

7
Maintenance
7-13
Normal maintenance schedule (CONT.)
52,500 miles (84,000 km) or 42 months
❑Inspect air cleaner filter
❑ Inspect HSG belt *2
(52,500 miles (84,000 km) or 84 months)
❑ Inspect vacuum hose
❑ Air intake hose
❑ Replace engine oil and filter
(52,500 miles (84,000 km) or 84 months)
❑ Add fuel additive *
1
(52,500 miles (84,000 km) or 84 months)
60,000 miles (96,000 km) or 48 months
❑ Inspect vacuum hose
❑ Inspect air conditioning refrigerant
❑ Inspect brake hoses and lines
❑ Inspect drive shafts and boots
❑ Inspect exhaust pipe and muffler
❑ Inspect front brake disc/pads, calipers
❑ Inspect rear brake disc/pads
❑ Inspect steering gear box, linkage & boots/lower arm ball
joint, upper arm ball joint
❑ Inspect suspension mounting bolts
❑ Inspect brake fluid
❑ Inspect fuel filter *
3
❑Inspect fuel cap, fuel lines, fuel hoses and connections
❑ Inspect fuel tank air filter (if equipped) *3
❑Inspect parking brake
❑ Inspect vapor hose and fuel filler cap
❑ Replace HSG belt *
2
(60,000 miles (96,000 km) or 48 months)
❑ Air intake hose
❑ Replace climate control air filter
(for evaporator and blower unit)
(Continued)
*1: 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.
*
2: Inspect HSG belt for evidence of cuts, crocks, excessive wear or oil saturation and replace if necessary. If drive belt
noise occurred, readjust drive belt tension before replace.
❈ Inspect : Inspect and if necessary, adjust, correct, clean or
replace.