ToyotaSienna2021Overview/toyota/sienna/2021/base/

2021 Toyota Sienna

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2021 Sienna.

Transmission Automatic (AV-S6)

The 2021 Toyota Sienna pairs an Automatic (AV-S6) transmission with an EPA-estimated 36 mpg across all cycles, a standout efficiency figure. Early data records 36 owner complaints, with air bags as the top concern area, and two recalls. Set against the model’s complaint history from 1996 to 2020—where the 2004 year peaked at 2,062 complaints and the 1997 year saw just 2—this 2021 model year’s low count places it among the more reliable entries, signaling a relatively trouble-free ownership experience.

Model year202520242023202220212020201920182017

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Lug nut torque76.0 ft-lbsOEM · verified
EPA fuel economy36/36/36 mpgEPA · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI 47 · 560 CCA battery, OE oil filter 90915YZZN1. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Battery groupBCI 47 · 560 CCAOEM · verified
Tail / brake / turnAUTOOEM · verified
Tire sizeP235/65R17 103TOEM · verified
Wheel / rim7 inOEM · verified

OE service part numbers OEM · verified

Engine oil filter90915YZZN1
Engine air filter1780177050 alt 17801F0020
Spark plug9091901289
Front wiper blades8522206250 alt 8521206250
Thermostat1632647020 alt 1603125011
Cabin air filter8713958010

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic (AV-S6)

Dimensions & weight NHTSA vPIC

Overall length203.5 in
Overall width78.3 in
Overall height69.7 in
Wheelbase120.5 in
Curb weight4740 lb
Track (front / rear)67.7 / 68.5 in

Ratings & economy EPA / vPIC

EPA city / highway / combined36 / 36 / 36 mpg
DrivetrainFront-Wheel Drive
Recommended fuelRegular Gasoline

Performance & power Independent road tests

0–60 mph, quarter-mile, horsepower and torque from independent road tests.

Independent road tests for the Sienna of this era, listed by trim and engine — this page spans more than one engine, so no single horsepower figure is shown.

7.6–7.9 sec0–60 mph (tested)quickest 7.60 sec — 2021 Limited Hybrid
YearTrim / engine0–60¼ mileHPDrivetrain
2021Limited Hybrid 2.5L I-4 + Elec 1.9-kWh7.60 sec15.70 sec245 hpAWD
2021Platinum Hybrid 2.5L I-4 + Elec 1.9-kWh7.60 sec15.80 sec245 hpFWD
2021Platinum Hybrid 2.5L I-4 + Elec 1.9-kWh7.70 sec15.80 sec245 hpAWD
2021Platinum Hybrid 2.5L I-4 + Elec 1.9-kWh7.90 sec16.10 sec245 hpFWD
2021XSE Hybrid 2.5L I-4 + Elec 1.9-kWh7.90 sec16.10 sec245 hpFWD
2022Woodland Edition Hybrid 2.5L I-4 + Elec 1.9-kWh8.50 sec16.50 sec245 hpAWD
2023Limited Hybrid 2.5L I-4 + Elec 1.9-kWh7.50 sec15.80 sec245 hpAWD
2024XSE Hybrid 2.5L I-4 + Elec 1.87-kWh7.60 sec15.80 sec245 hpAWD

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

Torque lug nuts to 76.0 ft-lbs.

Engine torques

Camshaft Bearing/Carrier Cap Bolts or Studs12.0 ft-lbs
Crankshaft Pulley and/or Damper Bolts192.0 ft-lbs
Engine Flywheel Bolts111.0 ft-lbs
Intake Manifold to Engine Bolts18.0 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs18.0 ft-lbs

Chassis torques

Lug Nuts76.0 ft-lbs

Ignition

Curb Idle Speed (No Load)Checking Speed: 1000 rpm
Curb Idle Speed Variance (No Load)50 rpm
Spark Plug ManufacturerToyota
Spark Plug Torque15.0 ft-lbs

Battery & A/C

RefrigerantR1234yf
Oil GroupPOE
Oil Type80
Standard BCI Group Number47
Standard BCI Cranking Performance560 cca

Service checks

RPM43.0-121.0 @ Idle rpm

Brakes

Minimum Pad Thickness0.039" in

Multi-step torque procedures OEM · verified

Connecting Rod (Large End) Bearings — tightening sequence 1 stages
128.0 ft. lbs., Step 2: 90°28 ft. lbs
Cylinder Head — tightening sequence 1 stages
166.0 ft. lbs., Step 2: 66.0 ft. lbs., Step 3: 90°, Step 4: 90°66 ft. lbs
Main Bearings — tightening sequence 1 stages
145.0 ft. lbs., Step 2: 90°45 ft. lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter every 10,000 mi; spark plugs at 120,000 mi; coolant every 50,000 mi. The big-interval services (every 50,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

Every 5,000 miBrake System (inspect) · Floor Mat (inspect) · Hybrid Battery Compartment Air Filter (inspect) · Tire & Wheel Assembly (rotate) · Universal Vehicle Operation (inspect all fluid levels) · Windshield Wiper Blade (inspect)
Every 10,000 miEngine Oil (drain & refill) · Engine Oil Filter (replace)
Every 15,000 miAir Conditioning Condenser (inspect) · Brake Line (inspect) · CV Joint Boot (inspect) · Engine Coolant System (inspect fluid level) · Exhaust System (Complete) (inspect) · Hybrid Inverter (inspect coolant level)
Every 30,000 miBrake Drum Assembly (inspect) · Brake Linings (inspect) · Brake Rotor (inspect) · Cabin Air Filter (replace) · Differential (inspect fluid level) · Engine Air Filter Element (replace)
Every 50,000 miEngine Coolant System (drain, flush & refill)
At 100,000 miEngine Coolant System (drain, flush & refill)
At 120,000 miSpark Plugs (replace)
At 150,000 miHybrid Inverter (drain, flush & refill coolant)
At 200,000 miHybrid Inverter (drain, flush & refill coolant)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

The 2021 Sienna was the first model year of a new generation, but NHTSA's federal record for that specific year is not populated in this dataset—the most recent complete record ends at 2020. Looking backward, 2020 recorded 36 complaints, 2 recalls, 0 investigations, and 153 TSBs, continuing a steady downward trend in complaints since 2017 (152 complaints) and a reduction in recalls from the 2017 peak of 10 down to 2 by 2020. The trajectory across the prior generation shows the Sienna fleet's complaint volume peaked sharply in 2004–2006 before steadily declining, with 2020 representing the generation's lowest complaint count and one of its lowest recall counts. For the 2021 model year specifically, the complaint data shows Air Bags as the dominant issue with 12 complaints, while Service Brakes, Visibility/Wiper, and Engine each logged only 2–3 complaints; notably, there were zero crash-related complaints and only one fire complaint. The absence of a 2021 entry in the year-by-year record means the target year cannot be directly benchmarked against subsequent model years for trend confirmation. The concrete takeaway is that 2021 appears to benefit from the prior generation's quality-improvement arc and shows no red flags in crash or fire complaints, but the concentration of Air Bag complaints warrants a pre-purchase inspection focused on that system—making it a reasonable purchase candidate if that specific component has been addressed under warranty or recall.

2
Open recalls
NHTSA campaigns
169
Service bulletins
Manufacturer communications
1
ODI investigations
Office of Defects Investigation
36
Owner complaints
0 involved a crash · 1 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Overall★★★★★
Frontal★★★★
Side★★★★★
Rollover★★★★

Owner complaints filed with NHTSA, by component

All 36 complaints on record, top 8 components.

Air Bags12
Service Brakes3
Visibility/Wiper3
Engine2
Seats2
Structure2
Electrical System,Lane Departure,Back Over Prevention1
Power Train,Electrical System,Fuel/Propulsion System1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 2 campaigns on record for this vehicle.

23V865000Air Bags:Sensor:Occupant ClassificationReported 20/12/2023

Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2020-2021 Avalon, Avalon Hybrid, Corolla, Highlander, Highlander Hybrid, RAV4, RAV4 Hybrid, Lexus ES350, Lexus RX350, Lexus RX450H, 2021 Sienna… Remedy: Dealers will inspect and replace the sensor as necessary, free of charge. Interim letters notifying owners of the safety risk were mailed in February 2024. Some final remedy owner…

25V086000Seats:Mid/Rear Assembly:ReclinerReported 13/02/2025

Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2021-2025 Sienna Hybrid vehicles. The bolts for the seatbacks on the third-row seat assemblies may not be tightened properly. As such, these… Remedy: Dealers will tighten the seat assembly bolts, free of charge. Owner notification letters were mailed April 1, 2025. Owners may contact Toyota's customer service at 1-800-331-4331…

Technical service bulletins NHTSA · verified

Showing 5 of 169 bulletins on record with NHTSA.

BulletinDateComponentSummary
22TE092026-05-14Electrical SystemAlthough the HV Floor Under Wire Harness and Rear Traction Motor Cable is covered by…
T-SB-0104-21 Rev22026-02-27EngineOBSOLETE NOTICE February 27, 2026: This bulletin is no longer applicable and is now…
T-SB-0106-22 Rev22026-01-30Electrical SystemOBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T-SB-0001-26.
T-SB-0001-262026-01-28Electrical SystemSome 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic…
T-SB-0055-24 Rev22026-01-07Unknown Or OtherSome 2005 – 2026 Toyota vehicles that have undergone water intrusion may exhibit a…

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P0420
Catalyst system efficiency below threshold — Bank 1
P0300
Random / multiple cylinder misfire detected
P0171
System too lean — Bank 1
P0455
Evaporative emission system leak detected — large leak
P0128
Coolant thermostat below regulating temperature
P0442
Evaporative emission system leak detected — small leak

VIN tools

Decode factory build data for a specific vehicle by VIN.

VIN
Decode a VIN to confirm the transmission and build data for a specific Sienna. OEM
Build data
Plant, GVWR class, engine and body data for any 17-character VIN.
Recalls
Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Reference guides

Cross-vehicle references for the kinds of data on this page.

Frequently asked

Does the 2021 Sienna have open recalls?

NHTSA lists 2 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the Sienna get?

EPA figures are 36 city / 36 highway / 36 combined mpg.