2021 Toyota 4Runner Fuel and Emissions Systems
Find Your Specific 2021 Toyota 4Runner Fuel and Emissions Systems
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 Gas Caps, Air Flow Sensors, Fuel Injectors 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.
Popular 2021 Toyota 4Runner Fuel and Emissions Systems Categories
Essential Fuel and Emissions Systems for 2021 Toyota 4Runners
Delphi – Fuel Injection Pressure Regulator (Part No.FP10519)
from
$143.99
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:
See More
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
Wells Vehicle Electronics – Fuel Injection Pressure Regulator 5G1360 (Part No.5G1360)
from
$111.99
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:
See More
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.
Delphi – Fuel Tank Cleaning Kit (Part No.FC01)
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:
See More
Product Features:
- Helps avoid premature fuel pump failure
- Lint free towel included
- Low suds formulation
- Removes harmful contaminants from the fuel tank
Mr. Gasket – High Performance Electric Fuel Pump – Universal Carbureted Engines (Part No.42S)
from
$65.99
Gravity fed type pump with simple two-wire design. Works on 12 Volt negative ground systems only. Includes fittings and mounting hardware along with easy to follow DIY instructions. Pumps require approximately one amp average draw at maximum delivery. Flow rate is 28 gallons per hour (GPH) at 2 to 3-1/2 pounds per square inch (PSI). Universal design for most import 4 & 6-cylinder carburetor applications. Please see part #12S for V8 gasoline applications, part #12D for diesel applications or part #12E for Ethanol, Methanol, E85 and Race Fuel applications. Solid-state worry free electronics. Eliminates vapor lock and flooding. Works well as a fuel transfer, booster, or stand-alone pump. Not recommended for diesel, methanol, ethanol, E85 or race fuel applications!!
Product Features:
See More
Product Features:
- Solid-state Worry Free Electronics
- Internal Pressure Regulating
- Universal Design Allows For Easy Installation
- No DiaphraGMs Or Mechanical Parts To Wear Out
- Makes An Excellent Fuel Transfer or Booster Pump
- Hose Barbs Fit 5/16″ Fuel Hose
- Self-priming, 2 wire design
- Eliminates vapor lock and flooding
Carquest Premium – Fuel Pump Module Assembly: Fuel Pump, Sending Unit and Strainer (Part No.M2542523)
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:
See More
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
Bosch – Oxygen Sensor: 4 Wire, 24.92" Long, Heated, Universal (Part No.15733)
from
$92.99
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:
See More
Product Features:
- Premium Bosch oxygen sensors are designed to improve fuel economy while reducing harmful emissions
- Includes Smart Link Connector, no soldering required
- No special tools required for installation
- Seared protection tube due to 100% functional quality test
- Performance meets or exceeds OE specifications
DENSO – Oxygen Sensor: Upstream, 4 Wire, 32.83" Long, Heated, Exact Fit (Part No.234-4152)
from
$142.99
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.
Product Features:
See More
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
Carquest Premium – Vapor Canister Purge Solenoid (Part No.CPC1617)
from
$87.99
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:
See More
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
Carquest Premium – Vapor Canister Purge Solenoid: Includes Mounting Hardware (Part No.CPC1105)
from
$124.99
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:
See More
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
Carquest Premium – Remanufactured Multi Port Fuel Injector (Part No.A212-1834)
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:
See More
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
Carquest Premium – Remanufactured Multi Port Fuel Injector (Part No.A212-3344)
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:
See More
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
Carquest Premium – Fuel Injector Seal Kit (Part No.AS041)
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:
See More
Product Features:
- Premium OE quality materials
- Services one injector
Carquest Premium – Gas Cap: Twist On, Reduces Air Pollution, 1 Pack (Part No.10817)
from
$15.99
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:
See More
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
Motorad – Non-Locking Tethered Fuel Tank Cap (Part No.MGC817T)
from
$24.29
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:
See More
Product Features:
- Come pre-assembled for quick and easy installation.
- Several fastener options to work with any fuel cap compartment configuration
- Fits vehicles orginally equipped with tether
- Reduces air pollution with proper sealing and venting
- Manufactured from durable, long-life materials
Motorad – Non-Locking Tethered Fuel Tank Cap (Part No.MGC838T)
from
$27.49
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:
See More
Product Features:
- Come pre-assembled for quick and easy installation.
- Several fastener options to work with any fuel cap compartment configuration
- Fits vehicles orginally equipped with tether
- Reduces air pollution with proper sealing and venting
- Manufactured from durable, long-life materials
Carquest Premium – Fuel Cap Tester Adapter (Part No.12422)
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:
See More
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
Carquest Premium – Fuel Cap Tester Adapter: (Part No.12427)
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:
See More
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
Carquest Premium – Fuel Cap Tester Adapter: (Part No.12410)
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:
See More
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
DENSO – Wideband Oxygen Sensor: Upstream, 4 Wire, 13.39" Long, Heated, Exact Fit (Part No.234-9002)
from
$225.99
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 at the first time.
Product Features:
See More
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
DENSO – Wideband Oxygen Sensor: Upstream, 4 Wire, 8.66" Long, Heated, Exact Fit (Part No.234-9051)
from
$209.99
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 at the first time.
Product Features:
See More
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
DENSO – Wideband Oxygen Sensor: Upstream, 4 Wire, 10.63" Long, Heated, Exact Fit (Part No.234-9001)
from
$215.99
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 at the first time.
Product Features:
See More
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
Hella – Mass Air Flow Sensor – 5-Pin Connector – Bolted/Bayonet – Without Housing (Part No.358095771)
from
$148.99
Breathe easy and drive smarter with HELLA’s Mass Air Flow Sensor. It delivers pinpoint airflow data for spot-on fuel-to-air ratios-boosting power, MPG, and throttle response. Plug-and-play install, OE-level accuracy, and the performance your engine craves.
Product Features:
See More
Product Features:
- Delivers long service life with robust sensor construction, designed for consistent performance in diverse environmental conditions
- Ensures accurate air-to-fuel ratio adjustment, supporting stable combustion efficiency and reduced engine emissions in varying conditions
- Improves fuel efficiency and engine response by providing high air-mass measuring precision with hot-film sensor technology
- Offers universal compatibility, ensuring seamless integration with most modern vehicles for reliable sensor installation and operation
- Enhances engine management with a broad dynamic measurement range that supports precise exhaust gas recirculation and accurate flow measurement
DENSO – Mass Air Flow Sensor (Part No.197-6030)
from
$207.99
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:
See More
Product Features:
- OE technology adapted for the aftermarket
- Reduces emissions, increased performance
- Delivers the highest reliability and detection accuracy
Hitachi – Mass Air Flow Sensor (Part No.MAF0053)
from
$272.99
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:
See More
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
Carquest Premium – HVAC Sun Sensor (Part No.WTA1919)
from
$122.99
Also known as the Solar Sensor, the Sun Sensor detects the amount of sun exposure in the passenger cabin and operates the automatic climate control system to comfort the vehicle passengers.
Product Features:
See More
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.
- Where applicable electrical connectors meet or exceed OE wire gauge, insulation, and terminal material requirements.
Carquest Premium – Ambient Air Temperature Sensor (Part No.WTA2054)
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:
See More
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.
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 19 Fuel and Emissions Systems for the 2021 Toyota 4Runner, designed to meet your needs without breaking the bank.
From
Gas Cap
replacements to
Air Flow 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 4Runner at great prices.
Our Fuel and Emissions Systems inventory for this model
ranges from just $5.99 to $1,215.99, with
an average price of $219.90.
Our 19 Fuel and Emissions Systems in stock come from 5 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 $109.99 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 Gas Caps for 2021 Toyota 4Runners
Enhance the driving experience in your Toyota with 1 quality Gas Cap components, starting at $9.99.
Carquest Premium – Tethered Fuel Cap (Part No.MGC4854T)
from
$9.99
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:
See More
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
Most Popular 2021 Toyota 4Runner Air Flow Sensors
Customize your Toyota with 3 Air Flow Sensors products
like Air- Fuel Ratio Sensors and
Ambient Air Temperature Sensors, all
priced under $332.99.
NTK – Wideband Oxygen Sensor: Air-Fuel Ratio 4 Wire, 9.8" Long, Heated, Direct Fit (Part No.24767)
from
$332.99
NTK 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. While conventional switching oxygen sensors only switch rich or lean, wideband oxygen (or Air-Fuel Ratio) sensors produce a linear output signal that allows the ECU determine exactly how rich or lean an engine is running and make continuous and precise adjustments of the air-fuel mixture to stay closest to stoichiometric, providing the best possible combustion and fewest emissions. A ceramics company at our core, NTK uses state-of-the art technology enabling complete control of the ceramics used in our wideband oxygen sensors from raw material to finished product. Trust The Sensor Specialist for full-line market support and OE application technology.
Product Features:
See More
Product Features:
- OEM QUALITY – NTK 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, NTK Oxygen Sensors offer superior OE fit, form, function
- OE TECHNOLOGY – Upgraded to the latest OE technologies, NTK 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 – NTK 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
- NTK ADVANTAGE – Superior dual-coated platinum interface and thinner ceramic element produces fastest light off and response times with best durability
DENSO – Wideband Oxygen Sensor: Upstream, 4 Wire, 9.92" Long, Heated, Exact Fit (Part No.234-9143)
from
$253.99
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 at the first time.
Product Features:
See More
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
Carquest Premium – Ambient Air Temperature Sensor (Part No.WTA2054)
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:
See More
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.
Top Picks for 2021 Toyota 4Runner Fuel Injectors
Upgrade Toyota 4Runners with top-quality Fuel Injectors parts, including 7 OEM and aftermarket selections for your 2021 model.
Carquest Premium – New Mass Air Flow Sensor – Sensor Only (Part No.MQ6225)
from
$109.99
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:
See More
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
DENSO – Mass Air Flow Sensor (Part No.197-6160)
from
$197.99
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:
See More
Product Features:
- OE technology adapted for the aftermarket
- Reduces emissions, increased performance
- Delivers the highest reliability and detection accuracy
Delphi – Fuel Injection Pressure Regulator (Part No.FP10683)
from
$209.99
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:
See More
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
Delphi – Mass Air Flow Sensor (Part No.AF10347)
from
$139.99
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:
See 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
Hella – Mass Air Flow Sensor – 5-Pin Connector – Plugged – Without Suction Pipe (Part No.009142961)
from
$159.99
Breathe easy and drive smarter with HELLA’s Mass Air Flow Sensor. It delivers pinpoint airflow data for spot-on fuel-to-air ratios-boosting power, MPG, and throttle response. Plug-and-play install, OE-level accuracy, and the performance your engine craves.
Product Features:
See More
Product Features:
- Delivers long service life with robust sensor construction, designed for consistent performance in diverse environmental conditions
- Ensures accurate air-to-fuel ratio adjustment, supporting stable combustion efficiency and reduced engine emissions in varying conditions
- Improves fuel efficiency and engine response by providing high air-mass measuring precision with hot-film sensor technology
- Offers universal compatibility, ensuring seamless integration with most modern vehicles for reliable sensor installation and operation
- Enhances engine management with a broad dynamic measurement range that supports precise exhaust gas recirculation and accurate flow measurement
Carquest Premium – Remanufactured Multi Port Fuel Injector (Part No.A212-3814)
from
$139.99
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:
See More
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
Carquest Premium – Fuel Injector Seal Kit (Part No.AS041)
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:
See More
Product Features:
- Premium OE quality materials
- Services one injector
In-Demand Oxygen Sensors for 2021 Toyota 4Runners
Select from 1 premium Oxygen Sensors parts for your 2021 Toyota 4Runner.
DENSO – Oxygen Sensor: 4 Wire, Direct Fit, Heated, Wire Length: 9.25" (Part No.234-8005)
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.
See More
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.
Carquest Premium – Fuel Pump Module Assembly: Fuel Pump, Sending Unit and Strainer (Part No.M2542523)
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:
See More
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
Delphi – Fuel Pump Module Assembly: With Float Arm (Part No.FG1763)
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:
See More
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
Delphi – Electric Fuel Pump & Strainer Set: 12V, 2 Male Blade Terminals, Ext. Strainer (Part No.FE0554)
from
$611.99
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:
See More
Product Features:
- 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
Carquest Premium – Fuel Cap Tester Adapter: (Part No.12427)
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:
See More
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
Carquest Premium – Fuel Cap Tester Adapter: (Part No.12410)
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:
See More
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 $109.99 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 $109.99. 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
$109.99
(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 19 Fuel and Emissions Systems that fit 2021 Toyota 4Runners, the following parts are the top sellers:
- Fuel Tank Cleaning Kit (11692237) – $12.49
- Mass Air Flow Sensor (10115668) – $197.99
- Vapor Canister Purge Solenoid: Includes Mounting Hardware (12479683) – $62.99
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 $5.99 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 $219.90. 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?
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 Injector Seal Kit (11692578) – $5.99
- Tethered Fuel Cap (50172038) – $9.99
- 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) – $109.99
What types of Fuel and Emissions Systems do you sell for my 2021 Toyota 4Runner?
As of 6/2/26, 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.
