2021 Toyota 4Runner Fuel and Emissions Systems

Name: Ambient Air Temperature Sensor
Brand: Carquest Premium
SKU: WTA1121
Price: 46.99 USD

Below you will find various in-demand Toyota Fuel and Emissions Systems, components and accessories for your 2021 4Runner. Advance Auto Parts has popular 4Runner parts like Air Flow Sensors, Fuel Injectors, Oxygen Sensors and more. You’ll also find aftermarket and OEM Fuel and Emissions Systems for other 4Runner model years including 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2022, 2023 and more. Select a category of 2021 Toyota 4Runner Fuel and Emissions Systems below and start saving instantly.

Please Select your Vehicle to See Exact Fit Parts

Popular 2021 Toyota 4Runner Fuel and Emissions Systems Categories

Air- Fuel Ratio Sensors

Fuel Tank Cleaning Kits

Air Flow Meters and Mass Air

Fuel Pumps

Oxygen Sensors

Canister Purge Solenoids

Fuel Injectors

Pressure Regulators

Ambient Air Temperature Sensors

Fuel Injector Seal Kits

Fuel Injector Gaskets

Fuel Cap Tester Adapters

Essential Fuel and Emissions Systems for 2021 Toyota 4Runners

from

$46.99

CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.

from

$29.99

The temperature of various systems must be reported to the engine control module (ECM) as well as other operating system controllers in the vehicle. Coolant temperature, cabin temperature, exhaust temperature and ambient temperature are just a few systems reported by a temperature sensor. The temperature sensor is fed 5 volts by the systems computer, within the sensor housing will be a thermistor, or dropping resistor whose resistance value will change as the temperature surrounding it changes. Changing resistance in the circuit will change the volt signal at the processor indicating the current operating value.

Product Features:

Product constructed to meet all design and operating characteristics as intended by the vehicle manufacturer.
100% thermo-shock and vibration tested to ensure superior performance in extreme conditions.
100% end-of-line tested to ensure accurate signal output providing product reliability, every time.
Tin plated lead frame prevents corrosion and ensures a reliable terminal connection under adverse ambient conditions.
Lead frame terminal size and location determined using image dimension measuring system or 3D laser scanner.
Application matched components ensures system operation in like new condition.

from

$12.49

When replacing a fuel pump or module, it’s extremely important to clean the tank. Existing dirt, debris, and contamination stuck in the fuel tank can clog the brand-new strainer. Delphi’s Fuel Tank Cleaning Kit (FC01) and Tool (FC02) can help clean your fuel tank in less than five minutes. The FC01 includes a low-suds solution, cloth, and gloves that works together with the FC02 to help clean those hard to reach places without having to remove the fuel tank. Visit our Resource Center for helpful tips and tricks on fuel pumps, technologies, and more: https://www.delphiautoparts.com/usa/en-US/resource-center.

Product Features:

Helps avoid premature fuel pump failure
Lint free towel included
Low suds formulation
Removes harmful contaminants from the fuel tank

from

$117.99

NGK is the world’s largest supplier and manufacturer of OEM oxygen sensors. Oxygen sensors play a critical role as part of the vehicle’s on-board diagnostic system in maintaining optimal engine performance, maximizing fuel efficiency and reducing harmful emissions. Providing constant closed loop feedback to the ECU, oxygen sensors help to control the air-fuel ratio while alerting OBDII systems of possible problems with fuel delivery or catalytic converter efficiency. A ceramics company at our core, uses state-of-the art technology enabling control of the ceramic element used in our oxygen sensors from raw material to finished product. Trust The Sensor Specialist for full-line market support and OE application technology.

Product Features:

OEM QUALITY: is the world’s largest supplier of original equipment oxygen sensors with renowned quality that meets or exceeds OEM specifications
PRODUCT ENGINEERING: Based on OE expertise, but specifically engineered for the aftermarket, Oxygen Sensors offer superior OE fit, form, function
OE TECHNOLOGY: Upgraded to the latest OE technologies, Oxygen Sensors are designed to reduce OE failures, enhance durability and performance
EXTENSIVE TESTING: OE development includes vibration and thermal shock testing. Testing during manufacturing guarantees quality and reliability
EASY INSTALLATION: Oxygen Sensors are equipped with OE specified, water-resistant connectors and harness accessory hardware for easy installation
ADVANCED CERAMIC SENSOR ELEMENT: 3-stage contaminant-resistant plasma jet and deposit trap overcoat protects against element poisoning
ADVANTAGE: Superior dual-coated platinum interface and thinner ceramic element produces fastest light off and response times with best durability

from

$104.99

Bosch is the world’s leading supplier and original equipment manufacturer of Oxygen Sensors. Bosch invented the automotive oxygen sensor and leads the way in sensor technology and innovation. From overall sensor design to the critical ceramic element, Bosch is known worldwide for quality and performance.

Product Features:

Premium Bosch oxygen sensors are designed to improve fuel economy while reducing harmful emissions
Direct Fit includes OE Connector for easy installation
Performance meets or exceeds OE specifications
True Direct-fit OE connectors and harness

from

$122.99

Maximize your vehicle’s efficiency and emissions control with Carquest Vapor Canister Purge Solenoids. Engineered for precision, these solenoids seamlessly regulate the flow of fuel vapors from the Vapor Canister to the engine for cleaner combustion, reducing harmful emissions. Built to meet and/or exceed OEM standards, Carquest Purge Solenoids offer reliable functionality, long-lasting durability, and easy installation.

Product Features:

Enhances overall engine performance by providing proper vapor flow to maintain correct air-fuel mixture.
Helps reduce harmful emissions and ensures compliance with environmental regulations by controlling the release of fuel vapors into the engine
Ensures precise operation with electromagnetic principles to control the flow of fuel vapors from the carbon canister to the engine
Manufactured from high quality engineered materials, resistant to fuel vapors and extreme temperatures, ensuring long lasting performance
Meets or exceeds all OEM specifications

from

$84.99

Enhances overall engine performance by providing proper vapor flow to maintain correct air-fuel mixture.
Helps reduce harmful emissions and ensures compliance with environmental regulations by controlling the release of fuel vapors into the engine
Ensures precise operation with electromagnetic principles to control the flow of fuel vapors from the carbon canister to the engine
Manufactured from high quality engineered materials, resistant to fuel vapors and extreme temperatures, ensuring long lasting performance
Meets or exceeds all OEM specifications

from

$61.99

CARQUEST’S line of remanufactured OEM fuel injectors are remanufactured using a proven 15 step process at a state-of-the-art remanufacturing facility in the U.S.A. Each injector is 100% tested under multiple operating conditions to ensure each injector meets or exceeds OE specifications for flow rate, spray pattern, coil resistance, form, fit and function. Each injector includes new external seals and O-rings.

Product Features:

Each unit is 100% tested to OE specifications
Includes new O-rings and seals made of premium OE quality materials
Includes application specific technical bulletin, where applicable

from

$61.99

Each unit is 100% tested to OE specifications
Includes new O-rings and seals made of premium OE quality materials
Includes application specific technical bulletin, where applicable

from

$127.99

WVE is a leading source of advanced vehicle electronics components for replacement applications in the automotive aftermarket and original equipment applications. WVE offers high-technology manufacturing along with innovative solutions and improvements to OE designs. Every component either matches or improves on the OE design to ensure fast, easy installation, superior performance and reliability.

Product Features:

Application matched components ensure fuel injection system meets all emission regulations.
Product constructed to meet all design and operating characteristics as intended by the vehicle manufacturer.

from

$98.99

Precision is key for the fuel pressure regulator on any vehicle. At Delphi, we use OE engineering to test our regulators and fuel technologies to ensure the utmost performance and durability. Our Nitrile¿ diaphragms are resilient against high-ethanol fuels, and we utilize two designs to help meet emissions standards while covering a wide array of domestic vehicles. With over 30 OE-proprietary innovations and 150 patents in fuel technologies, Delphi is regarded as a market leader in North American fuel management. Visit our Resource Center for helpful tips and tricks on fuel pumps technologies and more: https://www.delphiautoparts.com/usa/en-US/resource-center.

Product Features:

Precisely manufactured internal valves, diaphragms and springs means excellent performance under all engine operating conditions
Quiet operation, no audible regulator noise
Robust diaphragm materials means longer life, improved durability and compatibility with a wide range of fuels
Consistent and predictable fuel pressure throughout system range of control provides great drivability

from

$7.99

The Fuel Injection Idle Air Control Valve controls the engine idle speed by allowing air to bypass the closed throttle plate. The idle air control valve gasket should be replaced any time the valve is removed for cleaning or service.

Product Features:

Application matched component to ensure the system can be returned to like new condition.
Product constructed to meet all design and operating characteristics as intended by the vehicle manufacturer.

from

$6.99

Product Features:

DESIGNED FOR IMPERFECT SEALING SURFACES: Engineered and manufactured specifically for the repair environment to help seal imperfect sealing surfaces
SEALING TECHNOLOGIES: Exclusive sealing innovations and technologies with proprietary materials and unique design features to ensure a superior seal for your repair
ENGINEERING EXPERTISE: Parts are designed, reviewed, validated and approved by Fel-Pro engineers through rigorous research and development
REAL-WORLD TESTED: Parts are tested on-vehicle and validated to ensure optimal performance on the road
EVERY PART FOR THE REPAIR: Fel-Pro gasket sets include every part needed for the repair unless otherwise noted

from

$79.99

Carquest Premium electric fuel pumps are engineered by Carter Fuel Systems or Agility Auto Parts to meet or exceed Original Equipment (OE) specifications for fit, form and function. Our Carquest Premium fuel pumps are built to be installed in the Original Equipment module or assembly. We have invested in industry-leading quality upgrades, like upgraded turbine impellers and 100% carbon commutators, to deliver greater reliability. Carquest Premium electric fuel pumps are engineered with superior quality components to provide the longest life and reliable performance.

Product Features:

Meets or exceeds OE specifications for fit, form and function
100% carbon commutators provide resistance to aggressive fuels and double the life expectancy of the pump
OE upgraded turbine impellers greatly reduce fuel pulsation
All fuel pumps are 100% performance tested

from

$75.99

Meets or exceeds OE specifications for fit, form and function
100% carbon commutators provide resistance to aggressive fuels and double the life expectancy of the pump
OE upgraded turbine impellers greatly reduce fuel pulsation
All fuel pumps are 100% performance tested

from

$91.99

Meets or exceeds OE specifications for fit, form and function
100% carbon commutators provide resistance to aggressive fuels and double the life expectancy of the pump
OE upgraded turbine impellers greatly reduce fuel pulsation
All fuel pumps are 100% performance tested

from

$39.99

Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.

Product Features:

BAR Certified adapters
Adapter check’s a fuel cap’s ability to hold pressure.
Adapters meet EPA standards for recommended fleet coverage.
Check adapter application chart for specific makes and models

from

$17.79

Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.

Product Features:

BAR Certified adapters
Adapter check’s a fuel cap’s ability to hold pressure.
Adapters meet EPA standards for recommended fleet coverage.
Check adapter application chart for specific makes and models

from

$34.99

Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.

Product Features:

BAR Certified adapters
Adapter check’s a fuel cap’s ability to hold pressure.
Adapters meet EPA standards for recommended fleet coverage.
Check adapter application chart for specific makes and models

from

$225.99

DENSO Air/Fuel Ratio Sensors are manufactured and tested to the strictest OE standards for unparalleled peformance. Each component is precision-built for exact replacement and a first time fit. DENSO gives you the right part and the right fit¿ the first time.

Product Features:

Specifically designed to meet the increasing demands of today’s engines
100 percent checked for high temperature signal output, air tightness, continuity, and heat resistance for optimal efficiency and performance
Coated with aluminum oxide to prevent silicone and lead from contacting the ceramic element and damaging the platinum electrode
Double protection cover helps maintain proper unit temperature for quicker response times, which is critical to your vehicle’s fuel efficiency
Manufactured with a rugged stainless steel housing and porous PTFE filter to resist corrosion and contamination

from

$229.99

Specifically designed to meet the increasing demands of today’s engines
100 percent checked for high temperature signal output, air tightness, continuity, and heat resistance for optimal efficiency and performance
Coated with aluminum oxide to prevent silicone and lead from contacting the ceramic element and damaging the platinum electrode
Double protection cover helps maintain proper unit temperature for quicker response times, which is critical to your vehicle’s fuel efficiency
Manufactured with a rugged stainless steel housing and porous PTFE filter to resist corrosion and contamination

from

$259.99

Specifically designed to meet the increasing demands of today’s engines
100 percent checked for high temperature signal output, air tightness, continuity, and heat resistance for optimal efficiency and performance
Coated with aluminum oxide to prevent silicone and lead from contacting the ceramic element and damaging the platinum electrode
Double protection cover helps maintain proper unit temperature for quicker response times, which is critical to your vehicle’s fuel efficiency
Manufactured with a rugged stainless steel housing and porous PTFE filter to resist corrosion and contamination

from

$72.99

Carquest Premium mass air flow (MAF) sensors are built to meet the original equipment (OE) specifications for each application. Our MAF sensors are built by a manufacturer that meets IATF 16949 certified framework, an internationally recognized proof of quality in the automotive industry. Carquest Premium mass air flow sensors are 100% new and undergo extensive validation testing to ensure long-lasting performance and reliability.

Product Features:

Designed to meet OE specifications for fit, form and function
100% new unit with no core charge
Advanced micro-controlled technology delivers more accurate output in extreme temperatures
Extensive validation testing to ensure precision output for better performance and reliability
O-rings or gaskets included where applicable

from

$254.99

Hitachi¿s Air Flow Sensors (MAFs) measure the amount and characteristics of air entering the engine. Hitachi uses precision elements and high-quality components for enhanced durability and accurate air flow measurements. Hitachi MAFs are 100% air flow tested for ideal performance and are calibrated for each application ensuring your vehicle meets the strict emission standards set by the manufacturer. Details such as a contaminant bypass port (when applicable) and protected circuitry providing a durable and reliable product approved by OE manufacturers makes Hitachi¿s air flow sensors the premium choice.

Product Features:

Meets the OE performance and durability standards for this application
Welded connections instead of soldered for dependability
Contaminant bypass port provides reliable operation and increases longevity
Contaminant bypass port provides reliable operation and increases longevity
Meets the OE performance and durability standards for this application
Welded connections instead of soldered for dependability

from

$125.99

Every single Delphi mass air flow (MAF) sensor that we manufacture – whether with or without the housing – is built with calibrated all-new components and is never remanufactured. Our mass air flow sensors are designed and tested to meet or exceed OE requirements, and engineered for a perfect fit in more than 180 million vehicles on the road today in North America – including makes from Ford, Toyota, Nissan, Volkswagen, Hyundai, BMW, Honda, GM, Mazda, Subaru, Acura and more.

Product Features:

Delphi mass air flow sensors are the global benchmark for accuracy and signal noise
Delphi mass air flow sensors feature high quality sensing elements for outstanding performance over a wide range of ambient temperatures
Delphi is a manufacturer of OE mass air flow sensors since their first use over 30 years ago
All parts are calibrated and tested to match the OE part
Probe solution offered wherever possible to reduce repair time by eliminating the need to replace the flow tube
Delphi OE technology validated to match the vehicle applications

from

$41.99

Product Features:

Application matched component to ensure the system can be returned to like new condition.
Product constructed to meet all design and operating characteristics as intended by the vehicle manufacturer.

from

$5.99

CARQUEST fuel injector seal kits include the necessary O-rings and seals to properly reseal the injector, which is a recommended practice any time the injector is removed. Includes hard to find or previously dealer-only components.

Product Features:

Premium OE quality materials
Services one injector

from

$16.99

Premium OE quality materials
Services one injector

Upgrade your 2021 Toyota 4Runner with Top-Quality Fuel and Emissions Systems

When it comes to maintaining or upgrading your 2021 Toyota 4Runner, nothing is more important than using high-quality OEM or aftermarket parts that you can trust. Whether you’re repairing damage to your Toyota or enhancing its overall performance, Fuel and Emissions Systems are key to keeping your 4Runner functioning at its best. At Advance Auto Parts, we offer a wide selection of 17 Fuel and Emissions Systems for the 2021 Toyota 4Runner, designed to meet your needs without breaking the bank. From Air Flow Sensor replacements to Fuel Injectors upgrades, we’ve got you covered with parts that fit your vehicle perfectly and ensure long-lasting performance.

Affordable Prices and Wide Selection

Shopping for Fuel and Emissions Systems for any vehicle can be a hassle, especially if you’re on a budget. But with Advance Auto Parts, you can find high-quality Fuel and Emissions Systems for your 2021 Toyota 4Runner at great prices. Our Fuel and Emissions Systems inventory for this model ranges from just $5.79 to $1,215.99, with an average price of $214.70. Our 17 Fuel and Emissions Systems in stock come from 4 trusted brands, so you’re sure to find the right part for your 2021 Toyota 4Runner without overspending.

Top Brands and High Customer Satisfaction

Advance Auto Parts takes pride in offering only the best brands in the automotive industry. For your 2021 Toyota 4Runner, we stock popular OEM and aftermarket Fuel and Emissions Systems from top names like Carquest Premium, and more. Carquest Premium Fuel and Emissions Systems start at just $107.99 and boast an impressive 4.4 stars average rating from customers. With 8 customer reviews and counting, our 2021 Toyota 4Runner Fuel and Emissions Systems have a strong track record of reliability, ensuring you can trust your purchase.

Explore Related Parts and More

While you’re here, don’t forget to check out other essential categories that go hand in hand with Fuel and Emissions System upgrades. Explore related part types like Batteries and Chargers, Oil and Lubricants and more to make sure your 2021 Toyota 4Runner is always ready to roll. We’re committed to providing you with everything you need to keep your 4Runner in top shape, all in one place. Start shopping confidently below for your 2021 Toyota 4Runner!

Best-Selling Air Flow Sensors for 2021 Toyota 4Runners

Enhance the driving experience in your Toyota with 2 quality Air Flow Sensor components, starting at $59.99.

show more show less

from

$253.99

Specifically designed to meet the increasing demands of today’s engines
100 percent checked for high temperature signal output, air tightness, continuity, and heat resistance for optimal efficiency and performance
Coated with aluminum oxide to prevent silicone and lead from contacting the ceramic element and damaging the platinum electrode
Double protection cover helps maintain proper unit temperature for quicker response times, which is critical to your vehicle’s fuel efficiency
Manufactured with a rugged stainless steel housing and porous PTFE filter to resist corrosion and contamination

from

$59.99

Product constructed to meet all design and operating characteristics as intended by the vehicle manufacturer.
100% thermo-shock and vibration tested to ensure superior performance in extreme conditions.
100% end-of-line tested to ensure accurate signal output providing product reliability, every time.
Tin plated lead frame prevents corrosion and ensures a reliable terminal connection under adverse ambient conditions.
Lead frame terminal size and location determined using image dimension measuring system or 3D laser scanner.
Application matched components ensures system operation in like new condition.

Most Popular 2021 Toyota 4Runner Fuel Injectors

Customize your Toyota with 7 Fuel Injectors products like Air Flow Meters and Mass Air, Fuel Injector Gaskets, and Fuel Injectors, all priced under $209.99.

show more show less

from

$107.99

Designed to meet OE specifications for fit, form and function
100% new unit with no core charge
Advanced micro-controlled technology delivers more accurate output in extreme temperatures
Extensive validation testing to ensure precision output for better performance and reliability
O-rings or gaskets included where applicable

from

$5.79

Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust.

Product Features:

Meets or exceeds all original equipment specifications
Application specific design to ensure a perfect fit
Engineered and manufactured specifically for the repair environment
Unsurpassed quality you can trust
Validated for fit, form, and function

from

$172.99

DENSO’s innovate designs reduces the size and weight which allows for easy installation. Glass film coated sensing elements reduces contamination exposure and improves reliability.

Product Features:

OE technology adapted for the aftermarket
Reduces emissions, increased performance
Delivers the highest reliability and detection accuracy

from

$209.99

Precisely manufactured internal valves, diaphragms and springs means excellent performance under all engine operating conditions
Quiet operation, no audible regulator noise
Robust diaphragm materials means longer life, improved durability and compatibility with a wide range of fuels
Consistent and predictable fuel pressure throughout system range of control provides great drivability

from

$136.99

Delphi mass air flow sensors are the global benchmark for accuracy and signal noise
Delphi mass air flow sensors feature high quality sensing elements for outstanding performance over a wide range of ambient temperatures
Delphi is a manufacturer of OE mass air flow sensors since their first use over 30 years ago
All parts are calibrated and tested to match the OE part
Probe solution offered wherever possible to reduce repair time by eliminating the need to replace the flow tube
Delphi OE technology validated to match the vehicle applications

from

$139.99

Each unit is 100% tested to OE specifications
Includes new O-rings and seals made of premium OE quality materials
Includes application specific technical bulletin, where applicable

from

$5.99

Premium OE quality materials
Services one injector

Top Picks for 2021 Toyota 4Runner Oxygen Sensors

Upgrade Toyota 4Runners with top-quality Oxygen Sensors parts, including 1 OEM and aftermarket selections for your 2021 model.

show more show less

from

$116.99

DENSO Oxygen Sensors are manufactured and tested to the strictest OE standards for unparalleled peformance; Each component is precision built for exact replacement, and a first time fit; This innovative line features DENSO’s exclusive aluminum oxide trap layer, designed to protect the ceramic element from silicone and lead posining for improved engine performance, greater fuel efficiency, and unparalleled longevity; DENSO gives you the right part and the right fit, the first time.

In-Demand Fuel Tanks for 2021 Toyota 4Runners

Select from 1 premium Fuel Tanks parts for your 2021 Toyota 4Runner.

show more show less

from

$12.49

Helps avoid premature fuel pump failure
Lint free towel included
Low suds formulation
Removes harmful contaminants from the fuel tank

Most Sold 2021 Toyota 4Runner Fuel Pumps

Explore our best-selling Toyota parts for the 2021 4Runner among 5 OEM and aftermarket options starting from $17.79.

show more show less

from

$483.99

Carquest Premium fuel pump modules and assemblies are engineered by Carter Fuel Systems or Agility Auto Parts to meet or exceed Original Equipment (OE) specifications for fit, form and function. We have invested in industry-leading quality improvements like upgraded turbine impellers and 100% carbon commutators to deliver greater reliability. Carquest Premium fuel pump modules are supplied with the pump strainer and gaskets or seals when required for the application. Carquest Premium fuel pump modules are engineered with superior quality components to provide the longest life and reliable performance.

Product Features:

Meets or exceeds OE specifications for fit, form and function
100% carbon commutators provide resistance to aggressive fuels and double the life expectancy of the pump
OE upgraded turbine impellers greatly reduce fuel pulsation
All fuel pumps are 100% performance tested
Includes installation gaskets or seals where applicable

from

$1215.99

Delphi is a Tier 1 supplier to the majority of global vehicle manufacturers and has been a manufacturer of dependable fuel pumps and fuel delivery parts for over 80 years. With over 30 OE-proprietary innovations and 150 patents in fuel technologies, Delphi is regarded as a market leader in North American fuel management with sales coverage at over 95%. Learn more about our expert-led training programs and tech hotline at 1-877-463-3574. Visit our Resource Center for helpful tips and tricks on fuel pumps, technologies, and more: https://www.delphiautoparts.com/usa/en-US/resource-center.

Product Features:

Delphi is a global OE manufacturer and all fuel pumps are built to Delphi’s OE standards
Empty float height and float retention matches OE specifications and guarantees correct gas gauge reading
Lower amperage draws less load on vehicle’s electrical system
Part is validated, tested and matched to the right vehicle application
Always be sure to check and clean fuel tank to avoid unnecessary returns
Lower failure rates due to its innovative design and durability

from

$611.99

Delphi is a global OE manufacturer and all fuel pumps are built to Delphi’s OE standards
Delphi pumps are designed to operate under extreme temperatures with quick engine starts
Improved pump performance as a result of Delphi’s innovative design and durability
Restores fast pressure performance and system integrity, translating to better pumping through less energy
Part is validated, tested and matched to the right vehicle application
Lower amperage draws less load on vehicle’s electrical system
Always be sure to check and clean fuel tank to avoid unnecessary returns
Always replace the fuel strainer when doing a fuel pump repair

from

$34.99

Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.

Product Features:

BAR Certified adapters
Adapter check’s a fuel cap’s ability to hold pressure.
Adapters meet EPA standards for recommended fleet coverage.
Check adapter application chart for specific makes and models

from

$17.79

Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.

Product Features:

BAR Certified adapters
Adapter check’s a fuel cap’s ability to hold pressure.
Adapters meet EPA standards for recommended fleet coverage.
Check adapter application chart for specific makes and models

Top-Rated Fuel and Emissions Systems Brands For Your 2021 Toyota 4Runner

Shop for the best-rated brands offering Fuel and Emissions Systems and other products for your 2021 Toyota 4Runners. Below you’ll find some of our best rated Fuel and Emissions Systems from Carquest Premium, and more. Fuel and Emissions Systems from these brands that fit a 2021 4Runner start at just $107.99 and are rated as high as 4.4 stars. OEM and aftermarket Fuel and Emissions Systems don’t get more top quality, durable, and affordable than from the brands below.

Popular Carquest Premium 2021 Toyota 4Runner Fuel and Emissions Systems

When it comes to maintaining or upgrading your 2021 Toyota 4Runner, using quality Fuel and Emissions Systems is essential to ensure durability and a perfect fit. Carquest Premium ticks all of those boxes. We offer a wide selection of Carquest Premium Fuel and Emissions Systems, specifically designed for the 2021 Toyota 4Runner. With over 1 Carquest Premium brand Fuel and Emissions Systems in stock, you’re sure to find what you need. The prices for these top-notch parts start as low as $107.99. Plus, with over 2 customer reviews and an average rating of 4.4 stars, you can trust that our Carquest Premium Fuel and Emissions Systems will get the job done right. Choose Advance Auto Parts for reliability, quality, and expert-approved parts that keep your vehicle running strong.

from $107.99

(2)

New Mass Air Flow Sensor – Sensor Only

“Replacing the factory MAF sensor with this one seems to have fixed some annoying issues such as; engine surging, delayed throttle response and poor MP”

FAQs for 2021 Toyota 4Runner Fuel and Emissions Systems

Which Fuel and Emissions Systems are best-sellers for 2021 Toyota 4Runners?

Out of 17 Fuel and Emissions Systems that fit 2021 Toyota 4Runners, the following parts are the top sellers:

Fuel Tank Cleaning Kit (11692237) – $12.49
Fuel Injection Throttle Body Mounting Gasket (20780053) – $5.79
Mass Air Flow Sensor (10115668) – $172.99

What’s the price range for 2021 Toyota 4Runner Fuel and Emissions Systems?

Fuel and Emissions System prices for the 2021 Toyota 4Runner start at $5.79 and go up to $1,215.99 for the most premium parts.

What’s the average price of a Fuel and Emissions System for a 2021 Toyota 4Runner?

The average price for Fuel and Emissions Systems for the 2021 Toyota 4Runner is $214.70. Keep in mind the variety of part types within our Fuel and Emissions System category so you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Fuel and Emissions Systems for other Toyota 4Runner model years?

Yes, we currently carry Fuel and Emissions Systems for 40 model years of Toyota 4Runners between 1984 and 2025. Fuel and Emissions Systems are bought most frequently for the following model years: 2023, 2022, 2020, 2019, 2018, 2017, 2016, 2015, and 2014.

What are the cheapest Fuel and Emissions Systems for my 2021 Toyota 4Runner?

The cheapest 2021 Toyota 4Runner Fuel and Emissions Systems we carry in stock are:

Fuel Injection Throttle Body Mounting Gasket (20780053) – $5.79
Fuel Injector Seal Kit (11692578) – $5.99
Fuel Tank Cleaning Kit (11692237) – $12.49
Fuel Cap Tester Adapter: (10998917) – $17.79
Fuel Cap Tester Adapter: (10858454) – $34.99

What are the top-rated Fuel and Emissions Systems that fit the 2021 Toyota 4Runner?

Out of 8 reviews by customers, our 2021 Toyota 4Runner Fuel and Emissions Systems have an average customer rating of . These are some of the highest-rated Fuel and Emissions System types for the 2021 Toyota 4Runner and their top-rated products:

Fuel Injectors
- New Mass Air Flow Sensor – Sensor Only (11887154) – $107.99

What types of Fuel and Emissions Systems do you sell for my 2021 Toyota 4Runner?

As of 3/1/26, these are some of the most in-demand types of Fuel and Emissions Systems for a 2021 Toyota 4Runner:

Can I get help with 2021 Toyota 4Runner Fuel and Emissions System orders?

Contact our customer support team, by chat or phone, through the help desk page, where you can find instant answers about Toyota Fuel and Emissions Systems and more.

What is your return policy for Toyota 4Runner Fuel and Emissions Systems?

Advance Auto Parts keeps returns simple. For new Toyota 4Runner Fuel and Emissions Systems and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.

2021 Toyota 4Runner Fuel and Emissions Systems

Carquest Premium – Ambient Air Temperature Sensor (Part No.WTA1121)

Carquest Premium – Ambient Air Temperature Sensor (Part No.WTA1969)

Delphi – Fuel Tank Cleaning Kit (Part No.FC01)

NTK – Switching Oxygen Sensor: 4 Wire, 11.5" Long, Heated, Direct Fit (Part No.24848)

Bosch – Oxygen Sensor: 4 Wire, 10.63" Long, Heated, Exact Fit (Part No.13441)

Carquest Premium – Vapor Canister Purge Solenoid: Includes Mounting Hardware (Part No.CPC1105)

Carquest Premium – Vapor Canister Purge Solenoid: Includes Mounting Hardware (Part No.CPC1121)

Carquest Premium – Remanufactured Multi Port Fuel Injector (Part No.A212-1554)

Carquest Premium – Remanufactured Multi Port Fuel Injector (Part No.A212-3054)

Wells Vehicle Electronics – Fuel Injection Pressure Regulator 5G1561 (Part No.5G1561)

Delphi – Fuel Injection Pressure Regulator (Part No.FP10404)

Carquest Premium – Fuel Injection Idle Air Control Valve Gasket (Part No.ABA1165)

Felpro – Fuel Injection Plenum Gasket Set (Part No.MS 91724)

Carquest Premium – Fuel Pump (Part No.E259487)

Carquest Premium – Fuel Pump (Part No.E2542566)

Carquest Premium – Fuel Pump: Includes Wiring Harness (Part No.E260149)

Carquest Premium – Fuel Cap Tester Adapter (Part No.12422)

Carquest Premium – Fuel Cap Tester Adapter: (Part No.12410)

Carquest Premium – Fuel Cap Tester Adapter: (Part No.12427)

DENSO – Wideband Oxygen Sensor: Upstream, 4 Wire, 13.39" Long, Heated, Exact Fit (Part No.234-9002)

DENSO – Wideband Oxygen Sensor: Upstream, 4 Wire, 16.54" Long, Heated, Exact Fit (Part No.234-9003)

DENSO – Wideband Oxygen Sensor: Upstream, 4 Wire, 8.35" Long, Heated, Exact Fit (Part No.234-9144)

Carquest Premium – New Mass Air Flow Sensor – Sensor Only (Part No.MQ6237)

Hitachi – Mass Air Flow Sensor (Part No.MAF0053)

Delphi – Mass Air Flow Sensor (Part No.AF10603)

Wells Vehicle Electronics – Fuel Injector Repair Kit (Part No.2G1962)

Carquest Premium – Fuel Injector Seal Kit (Part No.AS041)

Carquest Premium – Fuel Injector Seal Kit (Part No.AS037)

DENSO – Wideband Oxygen Sensor: Upstream, 4 Wire, 9.92" Long, Heated, Exact Fit (Part No.234-9143)

Carquest Premium – Ambient Air Temperature Sensor (Part No.WTA2054)

Carquest Premium – New Mass Air Flow Sensor – Sensor Only (Part No.MQ6225)

Felpro – Fuel Injection Throttle Body Mounting Gasket (Part No.61445)

DENSO – Mass Air Flow Sensor (Part No.197-6160)

Delphi – Fuel Injection Pressure Regulator (Part No.FP10683)

Delphi – Mass Air Flow Sensor (Part No.AF10347)

Carquest Premium – Remanufactured Multi Port Fuel Injector (Part No.A212-3814)

Carquest Premium – Fuel Injector Seal Kit (Part No.AS041)

DENSO – Oxygen Sensor: 4 Wire, Direct Fit, Heated, Wire Length: 9.25" (Part No.234-8005)

Delphi – Fuel Tank Cleaning Kit (Part No.FC01)

Carquest Premium – Fuel Pump Module Assembly: Fuel Pump, Sending Unit and Strainer (Part No.M2542523)

Delphi – Fuel Pump Module Assembly: With Float Arm (Part No.FG1763)

Delphi – Electric Fuel Pump & Strainer Set: 12V, 2 Male Blade Terminals, Ext. Strainer (Part No.FE0554)

Carquest Premium – Fuel Cap Tester Adapter: (Part No.12427)

Carquest Premium – Fuel Cap Tester Adapter: (Part No.12410)