2021 Audi A4 allroad Fuel and Emissions Systems
Find Your Specific 2021 Audi A4 allroad Fuel and Emissions Systems
Below you will find various in-demand Audi Fuel and Emissions Systems, components and accessories for your 2021 A4 allroad. Advance Auto Parts has popular A4 allroad parts like Air Flow Sensors, Oxygen Sensors, Fuel Injectors and more. You’ll also find aftermarket and OEM Fuel and Emissions Systems for other A4 allroad model years including
2017,
2018,
2019,
2020,
2022,
2023,
2024 and more. Select a category of 2021 Audi A4 allroad Fuel and Emissions Systems below and start saving instantly.
Popular 2021 Audi A4 allroad Fuel and Emissions Systems Categories
Essential Fuel and Emissions Systems for 2021 Audi A4 allroads
DENSO – Oxygen Sensor: Downstream, 4 Wire, 28.74" Long, Heated, Exact Fit (Part No.234-4754)
from
$167.99
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 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:
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Product Features:
- Specifically designed to meet the increasing demands of today’s engines
- 100% 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
NTK – Switching Oxygen Sensor: 4 Wire, 20.75" Long, Heated, Direct Fit (Part No.25764)
from
$148.99
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. 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, NTK 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:
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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
NTK – Wideband Oxygen Sensor: Air-Fuel Ratio 5 Wire, 22.75" Long, Heated, Direct Fit (Part No.27050)
from
$149.99
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, 5 Wire, 28.82" Long, Heated, Exact Fit (Part No.234-5019)
from
$238.99
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:
See More
Product Features:
- Specifically designed to meet the increasing demands of today’s engines
- 100% 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, 5 Wire, 17.05" Long, Heated, Exact Fit (Part No.234-5163)
from
$186.99
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:
See More
Product Features:
- Specifically designed to meet the increasing demands of today’s engines
- 100% 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
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:
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Product Features:
- Helps avoid premature fuel pump failure
- Lint free towel included
- Low suds formulation
- Removes harmful contaminants from the fuel tank
Bosch – MAP Sensor (Part No.C70442424624BOS)
from
$48.08
MAP Sensor
Original Equipment – MAP Sensor (Part No.C7044666815OEA)
from
$51.97
Original Equipment Manifold Absolute Pressure/Manifold Air Temperature Sensors are designed to perform in harsh environments such as extreme temperatures and vibration, thermal and mechanical shock. The Original Equipment Manifold Absolute Pressure sensor is the ORIGINAL part, supplied in a plain box, with the car manufacturer’s logo on the part.
Product Features:
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Product Features:
- Designed for under-hood environments
- All-silicon, solid-state microelectronic technology
- Temperature compensation
- Electromagnetic interference (EMI) protection
- Air temperature output
Carquest Premium – Manifold Absolute Pressure Sensor (MAP) (Part No.ECA2453)
from
$101.99
CARQUEST MAP sensors are manufactured with critical OEM components to ensure that your engine runs efficiently to reach the best gas mileage on your vehicle.
Product Features:
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Product Features:
- CARQUEST MAP sensors connectors are exact OE fit to ensure the proper vacuum is maintained to prevent power loss and to minimize internal contamination.
- CARQUEST MAP sensors utilize high temperature resistant seals. Damaged seals can directly impact the vehicles fuel-to-air ratio, making it less fuel efficient.
- CARQUEST MAP sensors are 100% individually tested for all product functionalities including proper vacuum seal and electrical output.
Upgrade your 2021 Audi A4 allroad with Top-Quality Fuel and Emissions Systems
When it comes to maintaining or upgrading your 2021 Audi A4 allroad, nothing is more important than using high-quality OEM or aftermarket parts that you can trust. Whether you’re repairing damage to your Audi or enhancing its overall performance, Fuel and Emissions Systems are key to keeping your A4 allroad functioning at its best. At Advance Auto Parts, we offer a wide selection of 8 Fuel and Emissions Systems for the 2021 Audi A4 allroad, 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 Audi A4 allroad at great prices.
Our Fuel and Emissions Systems inventory for this model
ranges from just $10.59 to $227.99, with
an average price of $121.26.
Our 8 Fuel and Emissions Systems in stock come from 5 trusted brands, so you’re sure to find the right part for your 2021 Audi A4 allroad without overspending.
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 Audi A4 allroad is always ready to roll. We’re committed to providing you with everything you need to keep your A4 allroad in top shape, all in one place.
Start shopping confidently below for your 2021 Audi A4 allroad!
Best-Selling Air Flow Sensors for 2021 Audi A4 allroads
Enhance the driving experience in your Audi with 4 quality Air Flow Sensor components, starting at $48.08.
Bosch – MAP Sensor (Part No.C70442424624BOS)
from
$48.08
MAP Sensor
DENSO – Air-Fuel Ratio Sensor 4 Wire, Direct Fit, Heated, Wire Length: 22.83 (Part No.234-5738)
from
$227.99
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¿ the first time.
See More
DENSO – Air-Fuel Ratio Sensor 4 Wire, Direct Fit, Heated, Wire Length: 14.96 (Part No.234-5736)
from
$188.99
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¿ the first time.
See More
Carquest Premium – Manifold Absolute Pressure Sensor (MAP) (Part No.ECA2453)
from
$101.99
CARQUEST MAP sensors are manufactured with critical OEM components to ensure that your engine runs efficiently to reach the best gas mileage on your vehicle.
Product Features:
See More
Product Features:
- CARQUEST MAP sensors connectors are exact OE fit to ensure the proper vacuum is maintained to prevent power loss and to minimize internal contamination.
- CARQUEST MAP sensors utilize high temperature resistant seals. Damaged seals can directly impact the vehicles fuel-to-air ratio, making it less fuel efficient.
- CARQUEST MAP sensors are 100% individually tested for all product functionalities including proper vacuum seal and electrical output.
Most Popular 2021 Audi A4 allroad Oxygen Sensors
Customize your Audi with 2 Oxygen Sensors products
like Oxygen Sensors, all
priced under $210.99.
DENSO – Oxygen Sensor 4 Wire, Direct Fit, Heated, Wire Length: 29.92 (Part No.234-8064)
from
$210.99
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 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
DENSO – Oxygen Sensor 4 Wire, Direct Fit, Heated, Wire Length: 20.47 (Part No.234-8062)
from
$168.99
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 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
Top Picks for 2021 Audi A4 allroad Fuel Injectors
Upgrade Audi A4 allroads with top-quality Fuel Injectors parts, including 1 OEM and aftermarket selections for your 2021 model.
Vaico – FI Throttle Body Mou (Part No.C7001535020VCO)
from
$10.59
FI Throttle Body Mou
In-Demand Fuel Tanks for 2021 Audi A4 allroads
Select from 1 premium Fuel Tanks parts for your 2021 Audi A4 allroad.
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
FAQs for 2021 Audi A4 allroad Fuel and Emissions Systems
Which Fuel and Emissions Systems are best-sellers for 2021 Audi A4 allroads?
Out of 8 Fuel and Emissions Systems that fit 2021 Audi A4 allroads, the following parts are the top sellers:
- Fuel Tank Cleaning Kit (11692237) – $12.49
- MAP Sensor (12146824) – $48.08
- Manifold Absolute Pressure Sensor (MAP) (12450484) – $101.99
What’s the price range for 2021 Audi A4 allroad Fuel and Emissions Systems?
Fuel and Emissions System prices for the 2021 Audi A4 allroad start at $10.59 and go up to $227.99 for the most premium parts.
What’s the average price of a Fuel and Emissions System for a 2021 Audi A4 allroad?
The average price for Fuel and Emissions Systems for the 2021 Audi A4 allroad is $121.26. 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 Audi A4 allroad model years?
What are the cheapest Fuel and Emissions Systems for my 2021 Audi A4 allroad?
The cheapest 2021 Audi A4 allroad Fuel and Emissions Systems we carry in stock are:
- FI Throttle Body Mou (12589421) – $10.59
- Fuel Tank Cleaning Kit (11692237) – $12.49
- MAP Sensor (12146824) – $48.08
- Manifold Absolute Pressure Sensor (MAP) (12450484) – $101.99
- Oxygen Sensor 4 Wire, Direct Fit, Heated, Wire Length: 20.47 (50048084) – $168.99
What types of Fuel and Emissions Systems do you sell for my 2021 Audi A4 allroad?
As of 2/5/25, these are some of the most in-demand types of Fuel and Emissions Systems for a 2021 Audi A4 allroad:
Can I get help with 2021 Audi A4 allroad 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 Audi Fuel and Emissions Systems and more.
What is your return policy for Audi A4 allroad Fuel and Emissions Systems?
Advance Auto Parts keeps returns simple. For new Audi A4 allroad 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.
