2021 NISSAN SENTRA spark plugs replace

1. Visually inspect the belt for signs of un-usual wear, cuts, or fraying. If the belt is in
poor condition, have it replaced or ad-
justed. It is recommended that you visit a
NISSAN dealer for this service.
2. Have the belt checked regularly for condition.
REPLACING SPARK PLUGS
CAUTION
Be sure to use the correct socket to re-
move the spark plugs. An incorrect
socket can damage the spark plugs.
Iridium-tipped spark plugs
It is not necessary to replace iridium-
tipped
OAspark plugs as frequently as con-
ventional type spark plugs because they
last much longer. Follow the maintenance
log shown in the “Maintenance and sched-
ules” section of this manual. Do not service
platinum-tipped spark plugs by cleaning or
regapping.
• Always replace spark plugs with rec-
ommended or equivalent ones.
If replacement is required, it is recom-
mended that you visit a NISSAN dealer for
this service.
SDI1895
SPARK PLUGS
Do-it-yourself8-15

Engine coolant*:Replace coolant at the
specified interval. When adding or replac-
ing coolant, be sure to use only Genuine
NISSAN Long Life Antifreeze/Coolant (blue)
or equivalent with the proper mixture. (For
additional information on the proper mix-
ture for your area, refer to “Engine cooling
system” in the “Do-it-yourself ” section of
this manual.)
NOTE: Mixing any other type of coolant
or the use of non-distilled water may re-
duce the recommended service interval
of the coolant.
Engine oil and oil filter: Replace engine oil
and oil filter at the specified intervals. For
recommended oil grade and viscosity refer
to “Recommended fluids/lubricants and
capacities” in the “Technical and consumer
information” section of this manual.
Engine valve clearance*: Inspect only if
valve noise increases. Adjust valve clear-
ance if necessary.
Evaporative emissions control vapor
lines*: Check vapor lines for leaks or loose-
ness. Tighten connections or replace parts
as necessary.
Fuel filter: Periodic maintenance is not re-
quired. (in-tank type filter) Fuel lines*:
Check the fuel hoses, piping
and connections for leaks, looseness, or
deterioration. Tighten connections or re-
place parts as necessary.
Spark plugs: Replace at specified intervals.
Install new plugs of the type as originally
equipped.
CHASSIS AND BODY
MAINTENANCE:
Brake lines and cables: Visually inspect for
proper installation. Check for chafing,
cracks, deterioration, and signs of leaking.
Replace any deteriorated or damaged
parts immediately.
Brake pads, rotors, drums and linings:
Check for wear, deterioration and fluid
leaks. Replace any deteriorated or dam-
aged parts immediately.
Exhaust system: Visually inspect the ex-
haust pipes, muffler and hangers for leaks,
cracks, deterioration, and damage. Tighten
connections or replace parts as necessary.
In-cabin microfilter: Replace at specified
intervals. When driving for prolonged peri-
ods in dusty conditions, replace the filter
more frequently. Steering gear and linkage, axle and sus-
pension parts, drive shaf t boots:
Check
for damage, looseness, and leakage of oil
or grease. Under severe driving conditions,
inspect more frequently.
Tire rotation: Tires should be rotated every
7,500 miles (12,000 km) according to the in-
structions under “General maintenance” in
this section. When rotating tires, check for
damage and uneven wear. Replace if nec-
essary.
Transmission fluid/oil: Visually inspect for
signs of leakage at specified intervals. If
using a car-top carrier, or driving on rough
or muddy roads:
• Replace the manual transaxle gear oil ev- ery 20,000 miles or 24 months.
• Replace the CVT fluid every 60,000 miles (96,000 km) or request the dealer to in-
spect the fluid deterioration data using a
CONSULT. If the deterioration data is
more than 210000, replace the CVT fluid.
9-6Maintenance and schedules

STANDARD MAINTENANCE
Abbreviations: I = Inspect and correct or replace as necessary, R = ReplaceMAINTENANCE OPERATION
Perform at number of miles, kilometers or months, whichever comes first. Miles x 1,000
(km x 1,000) Months MAINTENANCE INTERVAL
7. 5
(12) 6 15
(24) 12 22.5
(36) 18 30
(48) 24 37.5
(60) 30 45
(72) 36 52.5
(84) 42 60
(96) 48 67.5
(108) 54 75
(120) 60 82.5
(132) 66 90
(144) 72 97.5
(156) 78 105
(168) 84 112.5
(180) 90 120
(192) 96
Air cleaner filter NOTE (1) R R R R
Brake fluid RRRR
Brake lines and cables I I I I I I I I
Brake pads and rotors III IIIII
CVT fluid NOTE (2) I I I I I I I I
Drive belts NOTE (3) I* I* I* I* I*
Engine coolant* NOTE (4)(5)
Engine oil & oil filter  R RRRRRR RRRRRRRRR
EVAP vapor lines & fuel lines I* I* I* I*
Exhaust system IIII
Front drive shaf t boots  III IIIII
Fuel filter NOTE (6)
In-cabin microfilter R R R R R R R R
Intake & exhaust valve clearance* NOTE (7)
Manual transmission gear oil NOTE (8) I I I I I I I I
NISSAN Intelligent Key® battery I R R R R
Spark plugs (Iridium/Platinum — tipped type) NOTE (9) Replace every 105,000 miles (168,000 km)
Steering gear & linkage, axle & suspension parts IIII
Tire rotation NOTE (10)
9-8Maintenance and schedules

Rear power windows.............2-71Rear seat.....................1-6Rear Sonar System (RSS)..........5-120Rear window and outside mirror defroster
switch..................... .2-55Rearview mirror................3-29RearView Monitor................4-9Recommended Fluids............10-2Recorders
Event Data................ .10-22Refrigerant recommendation.......10-8Registering a vehicle in another
country.................... .10-12Remote Engine Start..........3-20,5-15Reporting safety defects (US only). . . .10-20
S
Safety
Child safety rear door lock.........3-7Child seat belts.....1-23, 1-30, 1-36, 1-41Reporting safety defects (US only). .10-20Seat adjustment
Front manual seat adjustment......1-3Front power seat adjustment.......1-5Rear seat adjustment............1-6Seat beltChild safety..................1-21Infants and small children........1-22Injured person................1-15Larger children...............1-22Precautions on seat belt usage.....1-12Pregnant women..............1-15
Seat belt extenders............1-20Seat belt maintenance..........1-20Seat belts................1-12,7-7Shoulder belt height adjustment. . . .1-19Three-point type with retractor.....1-15Seat belt extenders..............1-20Seat belt warning light.........1-15,2-13Seatback pockets...............2-66SeatsAdjustment..................1-2Armrests....................1-7Front seats..................1-2Heated seats................2-62Manual front seat adjustment......1-3Rear seat.................. .1-6Security system (NISSAN Vehicle Immobilizer
System), engine start.........2-53, 5-14Security systems
Vehicle security system.........2-52Self-adjusting brakes.............8-18Service manual order form........10-22Servicing air conditioner...........4-44Shif t lock release...............5-19Shif tingContinuously Variable Transmission
(CVT)
.....................5-17Manual transmission...........5-22Shoulder belt height adjustment......1-19Siri® Eyes-Free................ .4-64Sonar
Rear system................5-120Spark plug replacement...........8-15Spark plugs...................8-15Specifications................ .10-9
Speedometer................. .2-4Speedometer and odometer........2-4Spotlights (See map light)..........2-75SRS warning label...............1-65Stability control................5-116Standard maintenance.........9-7,9-8Starting
Before starting the engine........5-14Jump starting.............6-9, 8-13Precautions when starting and
driving.................... .5-4Push starting................6-11Starting the engine............5-14Starting the engine..............5-14Starting the engine (models with NISSAN
Intelligent Key® system)...........5-14Steering
Power steering system.........5-113Steering wheel.................3-28Stop light....................8-26Storage.................... .2-66Storage tray..................2-67Sun visors....................3-28Sunglasses case...............2-68Sunglasses holder..............2-68Sunroof...................2-73,7-5Supplemental air bag warning labels. . .1-65Supplemental air bag warning
light................... .1-65, 2-14Supplemental front impact air bag
system..................... .1-52Supplemental restraint system
Information and warning labels.....1-65
11-6Index