2021 Toyota Avalon Fuel and Emissions Systems

Name: Air-Fuel Ratio Sensor 4 Wire, Direct Fit, Heated, Wire Length: 20.16"
Brand: DENSO
SKU: 234-9041
Price: 231.99 USD
Rating: 5.0 (18 reviews)

Below you will find various in-demand Toyota Fuel and Emissions Systems, components and accessories for your 2021 Avalon. Advance Auto Parts has popular Avalon parts like Air Flow Sensors, Oxygen Sensors, Fuel Injectors and more. You’ll also find aftermarket and OEM Fuel and Emissions Systems for other Avalon model years including 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2022 and more. Select a category of 2021 Toyota Avalon Fuel and Emissions Systems below and start saving instantly.

Popular 2021 Toyota Avalon Fuel and Emissions Systems Categories

Air- Fuel Ratio Sensors

Fuel Tank Cleaning Kits

Air Flow Meters and Mass Air

Gas Caps

Fuel Pumps

Oxygen Sensors

Fuel Vapor Leak Detection Pumps

Canister Purge Solenoids

Fuel Injectors

Ambient Air Temperature Sensors

Fuel Injector Seal Kits

Fuel Cap Tester Adapters

Fuel Injector Seal Tool Set

Essential Fuel and Emissions Systems for 2021 Toyota Avalons

from

$231.99

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

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

$209.99

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

$59.99

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.

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$54.99

CARQUEST premium engine management products provide the right automatic transmission speed sensor for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions. Designed to meet OE quali

Product Features:

Lifecycle tested to meet or exceed OE specifications
Direct OE replacement
High strength thermoplastic is resistant to shock, temperature and chemicals. Also protects internal components from moisture and contaminants.
Global coverage for import and/or domestic applications.

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$14.99

Manufactured with OEM quality materials and safety standards by an OE Supplier. Manufactured to pass all state and federal emissions requirements. Specifically designed pressure and vacuum relief valves to prevent evaporation of fuel. A leaking fuel cap can allow up to 30 gallons of gasoline to evaporate over the period of a year.

Product Features:

Passes all state and federal emissions tests
Manufactured from durable, long-life materials
Reduces air pollution with proper sealing and venting
Independently tested for emission control

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$15.49

Product Features:

Reduces air pollution with proper sealing and venting
Manufactured from durable, long-life materials
Reduces air pollution with proper sealing and venting
Independently tested for emission control

from

$101.99

DENSO Oxygen Sensors are manufactured and tested to the strictest OE standards for unparalleled performance. 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 poisoning for improved engine performance, greater fuel efficiency, and unparalleled longevity. DENSO gives you the right part and the right fit.

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

$83.99

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

$129.99

This premium tool kit is designed to ensure the correct installation of the combustion seal on Gasoline Direct Injectors (GDI), which require replacement any time the injector is reinstalled. This special tool allows for the expansion of the combustion seal to allow installation onto the injector’s tip and resizing tools to provide precise dimensioning to ensure proper combustion sealing. Constructed of high-quality stainless steel the tool will provide years of trouble-free service and can be used on over 100 unique styles of GDI injectors.

Product Features:

Includes two expansion cones
Includes two resizing tools
Includes one seal installation collet
Includes hard case
Includes instruction manual

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$151.99

The Evaporative Emission System is designed to control fuel vapors in the vehicle fuel storage system to prevent any release of fuel vapors into the atmosphere. In a normally operating system, released vapors from the fuel storage tank will be directed into an on-board charcoal canister via a piping system and control valves. Under the most ideal engine operating condition, the vapors will be pulled into the engine via a vapor Canister Purge Solenoid to be burned during the normal combustion process.

Product Features:

Application matched components ensure the vehicle will be returned to like new condition.
Product constructed to meet all design and operating characteristics as intended by the vehicle manufacturer.
Where applicable, features application specific mounting bracket providing ease of installation.

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$111.99

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

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$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

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$59.99

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

$88.99

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

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$125.99

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

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$5.99

Fel-Pro gaskets are specifically designed for the repair environment to deliver a reliable seal on even the most troublesome applications. Designed for imperfect sealing surfaces and manufactured with proprietary materials, you can count on Fel-Pro for innovative sealing solutions for the real-world repair environment.

Product Features:

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

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$11.99

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. Use CARQUEST tool kit ATK-001 or equivalent for proper installation of combustion seal.

Product Features:

Premium OE quality materials
Includes upper o-ring
Includes plastic split ring
Includes plastic split ring
Includes combustion seal

from

$156.99

DENSO’s innovated 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

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$106.99

Advance Auto Parts is proud to carry all new mass air flow sensors that use high-quality components with the highest quality standards.

Product Features:

CARQUEST MAF use all new high-quality components at the highest quality standards.
Manufactured with new and advanced technology to perform, fit and function at OE specifications.
All new product that is tested with OEM equipment to OEM standards
Outperforms competition when tested in extreme environmental conditions

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$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

$261.99

The Evaporative Emission System is designed to control fuel vapors in the vehicle fuel storage system to prevent any release of fuel vapors into the atmosphere. In a normally operating system, released vapors from the fuel storage tank will be directed into an on-board charcoal canister via a piping system and control valves. Under the most ideal engine operating condition, the vapors will be pulled into the engine to be burned during the normal combustion process.

Product Features:

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

from

$255.99

Keep your EVAP system in check and ensure top-tier emissions control with Carquest’s high-performance Leak Detection Pumps. Built for accuracy and durability, these Leak Detection Pumps offer reliable performance, compliance with strict emission standards, and simple, direct fit installation. For dependable, eco-friendly performance, trust Carquest Leak Detection Pumps to protect your vehicle and the environment.

Product Features:

The pump plays a critical role in identifying leaks in the EVAP system, preventing harmful fuel vapors from escaping into the atmosphere
Designed to create precise vacuum, ensuring accurate identification of leaks for enhanced vehicle performance
Equipped with integrated sensors that continuously monitor pressure levels, allowing for immediate detection of any leaks or malfunctions
Meets or exceeds all OEM specifications

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$244.99

This evaporative emissions system leak detection pump is designed to match the fit and function of the original pump on specified applications, and is engineered for reliable performance and durability.

Product Features:

Direct replacement – this evaporative emissions system leak detection pump is designed to match the fit and function of the original pump on specified applications
Restores functionality – reliable replacement for an original part that has clogged or failed due to emissions control system damage
Durable construction – this part is made from quality materials to ensure reliable performance and long service life
Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience

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$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

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

When it comes to maintaining or upgrading your 2021 Toyota Avalon, 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 Avalon functioning at its best. At Advance Auto Parts, we offer a wide selection of 24 Fuel and Emissions Systems for the 2021 Toyota Avalon, designed to meet your needs without breaking the bank. From Air Flow Sensor replacements to Oxygen Sensors 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 Avalon at great prices. Our Fuel and Emissions Systems inventory for this model ranges from just $7.99 to $438.99, with an average price of $168.46. Our 24 Fuel and Emissions Systems in stock come from 4 trusted brands, so you’re sure to find the right part for your 2021 Toyota Avalon 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 Avalon, 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 $14.99 and boast an impressive 4.4 stars average rating from customers. With 160 customer reviews and counting, our 2021 Toyota Avalon 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 Avalon is always ready to roll. We’re committed to providing you with everything you need to keep your Avalon in top shape, all in one place. Start shopping confidently below for your 2021 Toyota Avalon!

Best-Selling Air Flow Sensors for 2021 Toyota Avalons

Enhance the driving experience in your Toyota with 5 quality Air Flow Sensor components, starting at $59.99.

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from

$246.99

from

$236.99

from

$232.99

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.

from

$189.99

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 Avalon Oxygen Sensors

Customize your Toyota with 3 Oxygen Sensors products like Oxygen Sensors, all priced under $438.99.

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$438.99

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
Recommend to use OTC 6500 Flexihead O2 Sensor Wrench

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$189.99

from

$189.99

Top Picks for 2021 Toyota Avalon Fuel Injectors

Upgrade Toyota Avalons with top-quality Fuel Injectors parts, including 8 OEM and aftermarket selections for your 2021 model.

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from

$7.99

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. Each kit services one injector and includes hard to find or previously dealer-only components.

Product Features:

Premium OE quality materials
Services one injector

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$434.99

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

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$369.99

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.

from

$162.99

The CARQUEST line of remanufactured OEM fuel injectors are remanufactured using a proven 15 step process at a state-of-the-art remanufacturing facility in the USA. Injectors are thoroughly 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.

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

$129.99

Includes two expansion cones
Includes two resizing tools
Includes one seal installation collet
Includes hard case
Includes instruction manual

from

$119.99

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

$119.99

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

$11.99

Premium OE quality materials
Includes upper o-ring
Includes plastic split ring
Includes plastic split ring
Includes combustion seal

In-Demand Fuel Pumps for 2021 Toyota Avalons

Select from 4 premium Fuel Pumps parts for your 2021 Toyota Avalon, with prices ranging from $17.79 to $406.99.

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$406.99

Carquest Premium electric fuel pumps are built 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

$255.99

The pump plays a critical role in identifying leaks in the EVAP system, preventing harmful fuel vapors from escaping into the atmosphere
Designed to create precise vacuum, ensuring accurate identification of leaks for enhanced vehicle performance
Equipped with integrated sensors that continuously monitor pressure levels, allowing for immediate detection of any leaks or malfunctions
Meets or exceeds all OEM specifications

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

Most Sold 2021 Toyota Avalon Gas Caps

Explore our best-selling Toyota parts for the 2021 Avalon among 1 OEM and aftermarket options starting from $14.99.

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from

$14.99

Product Features:

Reduces air pollution with proper sealing and venting
Manufactured from durable, long-life materials
Reduces air pollution with proper sealing and venting
Independently tested for emission control

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

Shop for the best-rated brands offering Fuel and Emissions Systems and other products for your 2021 Toyota Avalons. 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 Avalon start at just $14.99 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 Avalon Fuel and Emissions Systems

When it comes to maintaining or upgrading your 2021 Toyota Avalon, 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 Avalon. 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 $14.99. Plus, with over 31 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 $14.99

(31)

Fuel Cap: Screw On, Direct Fit, Provides Tight Seal, 1 Pack

“solved check engine light”

FAQs for 2021 Toyota Avalon Fuel and Emissions Systems

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

Out of 24 Fuel and Emissions Systems that fit 2021 Toyota Avalons, the following parts are the top sellers:

Fuel Tank Cleaning Kit (11692237) – $12.49
Evaporative Emissions System Leak Detection Pump (12455777) – $255.99
Ambient Air Temperature Sensor (12507598) – $59.99

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

Fuel and Emissions System prices for the 2021 Toyota Avalon start at $7.99 and go up to $438.99 for the most premium parts.

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

The average price for Fuel and Emissions Systems for the 2021 Toyota Avalon is $168.46. 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 Avalon model years?

Yes, we currently carry Fuel and Emissions Systems for 26 model years of Toyota Avalons between 1995 and 2022. Fuel and Emissions Systems are bought most frequently for the following model years: 2022, 2020, 2019, 2018, 2017, 2016, 2015, 2014, and 2013.

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

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

Fuel Injector Seal Kit (11450352) – $7.99
Fuel Injector Seal Kit (50183788) – $11.99
Fuel Tank Cleaning Kit (11692237) – $12.49
Fuel Cap: Screw On, Direct Fit, Provides Tight Seal, 1 Pack (18481518) – $14.99
Fuel Cap Tester Adapter: (10998917) – $17.79

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

Out of 160 reviews by customers, our 2021 Toyota Avalon 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 Avalon and their top-rated products:

Fuel Injectors
- Fuel Injector Seal Kit (11450352) – $7.99

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

As of 11/2/25, these are some of the most in-demand types of Fuel and Emissions Systems for a 2021 Toyota Avalon:

Can I get help with 2021 Toyota Avalon 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 Avalon Fuel and Emissions Systems?

Advance Auto Parts keeps returns simple. For new Toyota Avalon 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 Avalon Fuel and Emissions Systems

DENSO – Air-Fuel Ratio Sensor 4 Wire, Direct Fit, Heated, Wire Length: 20.16" (Part No.234-9041)

DENSO – Wideband Oxygen Sensor: Upstream, 4 Wire, 14.17" Long, Heated, Exact Fit (Part No.234-9009)

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

Carquest Premium – Ambient Air Temperature Sensor (Part No.WTA2061)

Carquest Premium – Fuel Cap: Round, Direct Fit, Provides Tight Seal, 1 Pack (Part No.10837)

Carquest Premium – Non-Locking Fuel Tank Cap (Part No.10834)

DENSO – Oxygen Sensor: Downstream, 4 Wire, 9.45" Long, Heated, Exact Fit (Part No.234-4260)

DENSO – Oxygen Sensor: 4 Wire, 11.77" Long, Heated, Universal Fit (Part No.234-4209)

Carquest Premium – Premium GDI Seal Tool Kit (Part No.ATK-001)

Carquest Premium – Vapor Canister Purge Solenoid (Part No.CPA2742)

Carquest Premium – Vapor Canister Purge Solenoid: Includes Mounting Hardware (Part No.CPC1807)

Carquest Premium – Remanufactured Fuel Injector (Part No.A212-1324)

Carquest Premium – Remanufactured Fuel Injector (Part No.A212-3804)

Carquest Premium – Fuel Pump (Part No.E2246803)

Carquest Premium – Fuel Pump Includes Includes Strainer (Part No.E2496067)

Felpro – Fuel Injector O-Ring Kit (Part No.ES 71859)

Carquest Premium – Fuel Injector Seal Kit (Part No.AS096)

DENSO – Mass Air Flow Sensor (Part No.197-6020)

Carquest Premium – Mass Air Flow Sensor (MAF) – 100% NEW (Part No.MQ6225)

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)

Carquest Premium – Evaporative Emissions System Leak Detection Pump (Part No.VDC1067)

Carquest Premium – Evaporative Emissions System Leak Detection Pump (Part No.VDC1068)

Dorman – Fuel Vapor Leak Detection Pump (Part No.310-007)

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

DENSO – Air-Fuel Ratio Sensor 4 Wire, Direct Fit, Heated, Wire Length: 16.34" (Part No.234-9304)

DENSO – Air-Fuel Ratio Sensor 4 Wire, Direct Fit, Heated, Wire Length: 13.78" (Part No.234-9161)

DENSO – Air-Fuel Ratio Sensor 4 Wire, Direct Fit, Heated, Wire Length: 21.26" (Part No.234-9307)

DENSO – Wideband Oxygen Sensor: Upstream, 4 Wire, 13.46" Long, Heated, Exact Fit (Part No.234-9140)

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

Bosch – OXYGEN SENSOR (Part No.16576)

DENSO – Oxygen Sensor: 1 Wire, Direct Fit, Unheated, Wire Length: 11.02" (Part No.234-8073)

DENSO – Oxygen Sensor: 1 Wire, Direct Fit, Unheated, Wire Length: 10.43" (Part No.234-8072)

Carquest Premium – Fuel Injector Seal Kit (Part No.AS024A)

Delphi – Mass Air Flow Sensor (Part No.AF10658)

DENSO – Mass Air Flow Sensor (Part No.197-7020)

Carquest Premium – Reman GDI Fuel Injector (Part No.A512-1524)

Carquest Premium – Premium GDI Seal Tool Kit (Part No.ATK-001)

Carquest Premium – Reman Multi Port Fuel Injector (Part No.A212-4254)

Carquest Premium – Reman Multi Port Fuel Injector (Part No.A212-4284)

Carquest Premium – Fuel Injector Seal Kit (Part No.AS096)

Carquest Premium – Fuel Pump E4528510: Includes Strainer (Part No.E4528510)

Carquest Premium – Evaporative Emissions System Leak Detection Pump (Part No.VDC1068)

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

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

Carquest Premium – Fuel Cap: Screw On, Direct Fit, Provides Tight Seal, 1 Pack (Part No.10825)