2021 Audi A4 Quattro Ignition and Tune-Up Products

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Essential Ignition and Tune-Up Products for 2021 Audi A4 Quattros

Carquest Premium – Coil On Plug Insulator Boot: Spring included, Designed for direct fit (Part No.35-7021)

Coil On Plug Insulator Boot: Spring included, Designed for direct fit

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$12.49
Carquest Premium spark plug boots are engineered to restore ignition boot reliability and performance. They are designed to meet or exceed original equipment (O.E.) specifications for fit, form and function. Our spark plug boots offer excellent heat resistance as well as maximum protection against spark loss. Carquest Premium spark plug boots are built with a durable silicone compound for resistance to high heat and abrasion, resulting in a longer-lasting ignition repair.

Product Features:


    Product Features:
    • OE design provides an exact fit for your application
    • Provides excellent heat resistance as well as maximum protection against spark loss
    • Durable silicone compound for resistance to high heat or abrasion
    • Spring included with the spark plug boot
    • Design for direct compatibility
    • Multipack provides one time replace all COP for better deal
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Carquest Premium – Coil On Plug Insulator Boot: Spring included, Designed for direct fit (Part No.35-7176)

Coil On Plug Insulator Boot: Spring included, Designed for direct fit

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$12.49
Carquest Premium spark plug boots are engineered to restore ignition boot reliability and performance. They are designed to meet or exceed original equipment (O.E.) specifications for fit, form and function. Our spark plug boots offer excellent heat resistance as well as maximum protection against spark loss. Carquest Premium spark plug boots are built with a durable silicone compound for resistance to high heat and abrasion, resulting in a longer-lasting ignition repair.

Product Features:


    Product Features:
    • OE design provides an exact fit for your application
    • Provides excellent heat resistance as well as maximum protection against spark loss
    • Durable silicone compound for resistance to high heat or abrasion
    • Spring included with the spark plug boot
    • Design for direct compatibility
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Carquest Premium – Knock Sensor (Part No.SBC4239)

Knock Sensor

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$113.99
Carquest Knock Sensors respond to a wide range of engine knock frequencies providing accurate engine condition to the ECM for optimal ignition timing. Highest quality piezoceramic element manufactured to tight tolerances for increased durability. All Carquest Knock Sensors are designed to meet or exceed OEM specifications at our ISO TS16949 manufacturing facilities.

Product Features:
  • Precision piezoceramic element ensures accurate response to a wide range of engine vibrations
  • Manufactured using the highest quality OEM materials to ensure optimal performance and rugged durability
  • Designed to meet or exceed all OEM specifications in fit, form & function
  • Extensive product testing includes salt spray, high/low temperature impact, thermal cycling, vibration, drop among other tests, to ensure all sensors meet or exceed OEM specifications.
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Carquest Premium – Knock Sensor (Part No.SBC3981)

Knock Sensor

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$42.99
Carquest Knock Sensors respond to a wide range of engine knock frequencies providing accurate engine condition to the ECM for optimal ignition timing. Highest quality piezoceramic element manufactured to tight tolerances for increased durability. All Carquest Knock Sensors are designed to meet or exceed OEM specifications at our ISO TS16949 manufacturing facilities.

Product Features:
  • Precision piezoceramic element ensures accurate response to a wide range of engine vibrations
  • Manufactured using the highest quality OEM materials to ensure optimal performance and rugged durability
  • Designed to meet or exceed all OEM specifications in fit, form & function
  • Extensive product testing includes salt spray, high/low temperature impact, thermal cycling, vibration, drop among other tests, to ensure all sensors meet or exceed OEM specifications.
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Carquest Premium – Knock Sensor (Part No.SBC4186)

Knock Sensor

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$65.99
Carquest Knock Sensors respond to a wide range of engine knock frequencies providing accurate engine condition to the ECM for optimal ignition timing. Highest quality piezoceramic element manufactured to tight tolerances for increased durability. All Carquest Knock Sensors are designed to meet or exceed OEM specifications at our ISO TS16949 manufacturing facilities.

Product Features:
  • Precision piezoceramic element ensures accurate response to a wide range of engine vibrations
  • Manufactured using the highest quality OEM materials to ensure optimal performance and rugged durability
  • Designed to meet or exceed all OEM specifications in fit, form & function
  • Extensive product testing includes salt spray, high/low temperature impact, thermal cycling, vibration, drop among other tests, to ensure all sensors meet or exceed OEM specifications.
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Carquest Premium – Knock Sensor (Part No.SBC3897)

Knock Sensor

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$63.99
Carquest Knock Sensors respond to a wide range of engine knock frequencies providing accurate engine condition to the ECM for optimal ignition timing. Highest quality piezoceramic element manufactured to tight tolerances for increased durability. All Carquest Knock Sensors are designed to meet or exceed OEM specifications at our ISO TS16949 manufacturing facilities.

Product Features:
  • Precision piezoceramic element ensures accurate response to a wide range of engine vibrations
  • Manufactured using the highest quality OEM materials to ensure optimal performance and rugged durability
  • Designed to meet or exceed all OEM specifications in fit, form & function
  • Extensive product testing includes salt spray, high/low temperature impact, thermal cycling, vibration, drop among other tests, to ensure all sensors meet or exceed OEM specifications.
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Delphi – Knock Sensor (Part No.AS10169)

Knock Sensor

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$24.29
Delphi’s ever growing portfolio of high quality vehicle sensors are backed by stringent OE development and product validation methods. We offer a wide range of sensors, including ABS, camshaft, crankshaft, knock, EGT, MAP, temperature, throttle position, and vehicle speed sensors for a variety of vehicle applications. All of our sensors are tested and calibrated to OE standards, ensuring accurate readings, which helps to reduce comebacks.

Product Features:
  • Delphi knock sensors help maximize engine performance with all fuels
  • Delphi knock sensors prevent against engine damage from pre ignition knocking
  • Calibrated for a wide variety of frequencies to detect shifts, and adjust to provide accurate signals to help maximize engine performance
  • Delphi knock sensors are sealed to withstand humidity, salt spray, and automotive fluids
  • Ground isolated design with 2 wire shielded harness helps protect the sensor signal from electro magnetic interference (EMI)
  • Self generating piezoelectric design requires no power to the sensor
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Carquest Premium – Ignition Knock (Detonation) Sensor (Part No.SBA4323)

Ignition Knock (Detonation) Sensor

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$58.99
Carquest Premium knock sensors are designed to perform in harsh engine environments and meet or exceed original equipment (O.E.) specifications. Carquest Premium knock sensors are built by manufacturers that meet IATF 16949 certified framework, an internationally recognized proof of quality in the automotive industry. We utilize advanced technology to design sensors that are, in many cases, stronger than OE parts. Carquest Premium knock sensors undergo extensive validation testing to ensure long-lasting performance and reliability. Carquest Premium knock sensors are part of our Carquest Vehicle Solutions, which is a full line of engine management and electronics products that help control ignition, fuel delivery and emission systems. Carquest Vehicle Solutions are OE-quality parts designed, engineered and tested by world-class manufacturers to ensure a reliable and long-lasting repair.

Product Features:
  • Designed to meet or exceed OE specifications for fit, form and function
  • Trivalent iridescent chromate plating prevents corrosion
  • Silicone seals prevent moisture intrusion preventing false codes and sensor failure
  • Wiring harnesses utilize high-temperature insulation when applicable
  • Extensive design validation testing and 100% end-of-line tested
  • Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
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Carquest Premium – Ignition Knock (Detonation) Sensor (Part No.EKA1053)

Ignition Knock (Detonation) Sensor

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$87.99
Carquest Premium knock sensors are designed to perform in harsh engine environments and meet or exceed original equipment (O.E.) specifications. Carquest Premium knock sensors are built by manufacturers that meet IATF 16949 certified framework, an internationally recognized proof of quality in the automotive industry. We utilize advanced technology to design sensors that are, in many cases, stronger than OE parts. Carquest Premium knock sensors undergo extensive validation testing to ensure long-lasting performance and reliability. Carquest Premium knock sensors are part of our Carquest Vehicle Solutions, which is a full line of engine management and electronics products that help control ignition, fuel delivery and emission systems. Carquest Vehicle Solutions are OE-quality parts designed, engineered and tested by world-class manufacturers to ensure a reliable and long-lasting repair.

Product Features:
  • Designed to meet or exceed OE specifications for fit, form and function
  • Trivalent iridescent chromate plating prevents corrosion
  • Silicone seals prevent moisture intrusion preventing false codes and sensor failure
  • Wiring harnesses utilize high-temperature insulation when applicable
  • Extensive design validation testing and 100% end-of-line tested
  • Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
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Carquest Premium – Ignition Knock (Detonation) Sensor (Part No.SBA4187)

Ignition Knock (Detonation) Sensor

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$91.99
Carquest Premium knock sensors are designed to perform in harsh engine environments and meet or exceed original equipment (O.E.) specifications. Carquest Premium knock sensors are built by manufacturers that meet IATF 16949 certified framework, an internationally recognized proof of quality in the automotive industry. We utilize advanced technology to design sensors that are, in many cases, stronger than OE parts. Carquest Premium knock sensors undergo extensive validation testing to ensure long-lasting performance and reliability. Carquest Premium knock sensors are part of our Carquest Vehicle Solutions, which is a full line of engine management and electronics products that help control ignition, fuel delivery and emission systems. Carquest Vehicle Solutions are OE-quality parts designed, engineered and tested by world-class manufacturers to ensure a reliable and long-lasting repair.

Product Features:
  • Designed to meet or exceed OE specifications for fit, form and function
  • Trivalent iridescent chromate plating prevents corrosion
  • Silicone seals prevent moisture intrusion preventing false codes and sensor failure
  • Wiring harnesses utilize high-temperature insulation when applicable
  • Extensive design validation testing and 100% end-of-line tested
  • Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
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DENSO – Direct Ignition Coil – Original Equipment Quality (Part No.673-9303)

Direct Ignition Coil - Original Equipment Quality

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$51.99
As the innovator and leader in stick coil technology DENSO has conducted superior testing and inspection processes to insure the highest quality ignition coil. Don’t be fooled by imitations – look for the DENSO name to be sure you’re getting the best.

Product Features:
  • First Time Fit
  • Built to DENSO Original Equipment Standards
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Carquest Premium – Ignition Coil (Part No.EBN1806)

Ignition Coil

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$178.99
Carquest Premium ignition coils meet or exceed original equipment (OE) specifications and are developed by top OE/OES manufacturers to ensure superior performance. All of our Carquest Premium ignition coils are developed by IATF 16949 certified manufacturers for consistent durability and long-lasting performance. These ignition coils use high-quality components and will utilize optimized designs on applications where the OE ignition coil had frequent failures. We require stringent testing standards to ensure proper fit and performance for each application and stand behind our Carquest Premium ignition coils with an industry-leading warranty. Carquest Premium ignition coils are part of our Carquest Vehicle Solutions, which is a full line of engine management and electronics products that help control ignition, fuel delivery and emission systems. Carquest Vehicle Solutions are OE-quality parts designed, engineered and tested by world-class manufacturers to ensure a reliable and long-lasting repair.

Product Features:
  • Built by IATF 16949 certified manufacturers for consistent durability
  • Coil drivers match OE for current limit, electrostatic discharge (ESD) protection and multi-spark
  • Segmented secondary bobbins to distribute high voltage and prevent shorting
  • 100% end-of-line tested to ensure proper performance
  • Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
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Carquest Premium – Ignition Coil (Part No.EBE1706)

Ignition Coil

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$241.99
Carquest Premium ignition coils meet or exceed original equipment (OE) specifications and are developed by top OE/OES manufacturers to ensure superior performance. All of our Carquest Premium ignition coils are developed by IATF 16949 certified manufacturers for consistent durability and long-lasting performance. These ignition coils use high-quality components and will utilize optimized designs on applications where the OE ignition coil had frequent failures. We require stringent testing standards to ensure proper fit and performance for each application and stand behind our Carquest Premium ignition coils with an industry-leading warranty. Carquest Premium ignition coils are part of our Carquest Vehicle Solutions, which is a full line of engine management and electronics products that help control ignition, fuel delivery and emission systems. Carquest Vehicle Solutions are OE-quality parts designed, engineered and tested by world-class manufacturers to ensure a reliable and long-lasting repair.

Product Features:
  • Built by IATF 16949 certified manufacturers for consistent durability
  • Coil drivers match OE for current limit, electrostatic discharge (ESD) protection and multi-spark
  • Segmented secondary bobbins to distribute high voltage and prevent shorting
  • 100% end-of-line tested to ensure proper performance
  • Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
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Carquest Premium – Ignition Coil Set: Meets or Exceeds OE Specifications, 4 Count (Part No.EBC1001-4)

Ignition Coil Set: Meets or Exceeds OE Specifications, 4 Count

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$137.99
Carquest Premium ignition coil sets meet or exceed original equipment (OE) specifications and are developed by top OE/OES manufacturers to ensure superior performance. All of our Carquest Premium ignition coil sets are developed by IATF 16949 certified manufacturers for consistent durability and long-lasting performance. These ignition coils use high-quality components and will utilize optimized designs on applications where the OE ignition coil had frequent failures. We require stringent testing standards to ensure proper fit and performance for each application and stand behind our Carquest Premium ignition coil sets with an industry-leading warranty. Carquest Premium ignition coil sets are part of our Carquest Vehicle Solutions, which is a full line of engine management and electronics products that help control ignition, fuel delivery and emission systems. Carquest Vehicle Solutions are OE-quality parts designed, engineered and tested by world-class manufacturers to ensure a reliable and long-lasting repair.

Product Features:
  • Built by IATF 16949 certified manufacturers for consistent durability
  • Coil drivers match OE for current limit, electrostatic discharge (ESD) protection and multi-spark
  • Segmented secondary bobbins to distribute high voltage and prevent shorting
  • Extensive design validation testing to ensure long-lasting reliability
  • 100% end-of-line tested to ensure proper performance
  • Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
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Delphi – Ignition Coil (Part No.GN10294)

Ignition Coil

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$53.99
Every single Delphi ignition coil is designed and endurance tested using high quality materials. This ensures fast starts, consistent engine performance and optimized fuel efficiency. We makes more than 10 million ignition coils for North America each year, and each one is engineered to OE design specifications for vehicles from Ford, Toyota, Nissan, Lexus, GM, Mazda, Chrysler, Subaru, Acura and more.

Product Features:
  • Delphi coils provide OE performance, durability and electromagnetic capacity level requirements
  • Delphi ignition coils are designed to insert power into spark plugs to ensure fast starts, consistent engine performance and optimized fuel efficiency
  • Delphi uses smart winding process techniques to controls wire lengths, keeping voltage the same
  • We manufacture our ignition coils with a high quality wire coating that resists imperfections that lead to failure
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DENSO – Direct Ignition Coil – Original Equipment Quality (Part No.673-9302)

Direct Ignition Coil - Original Equipment Quality

from

$49.49
As the innovator and leader in stick coil technology DENSO has conducted superior testing and inspection processes to insure the highest quality ignition coil. Don’t be fooled by imitations – look for the DENSO name to be sure you’re getting the best.

Product Features:
  • First Time Fit
  • Built to DENSO Original Equipment Standards
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Delphi – Ignition Coil (Part No.GN10345)

Ignition Coil

from

$46.49
Every single Delphi ignition coil is designed and endurance tested using high quality materials. This ensures fast starts, consistent engine performance and optimized fuel efficiency. We makes more than 10 million ignition coils for North America each year, and each one is engineered to OE design specifications for vehicles from Ford, Toyota, Nissan, Lexus, GM, Mazda, Chrysler, Subaru, Acura and more.

Product Features:
  • Delphi coils provide OE performance, durability and electromagnetic capacity level requirements
  • Delphi ignition coils are designed to insert power into spark plugs to ensure fast starts, consistent engine performance and optimized fuel efficiency
  • Delphi uses smart winding process techniques to controls wire lengths, keeping voltage the same
  • We manufacture our ignition coils with a high quality wire coating that resists imperfections that lead to failure
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NGK – Premium COP Pencil Type Ignition Coil: Meets or Exceeds OE Specifications (Part No.48978)

Premium COP Pencil Type Ignition Coil: Meets or Exceeds OE Specifications

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$49.49
NGK ignition coils are manufactured to meet or exceed OE standards for the highest durability and operational performance, so they can be installed with confidence. NGK and their family of automotive products have over 80 years’ experience and are driven by extreme dedication to innovation, performance and quality. With state-of-the-art manufacturing, inventory and distribution facilities in North America and globally, NGK is dedicated to providing customers with world-class products and services. Developed and rigorously tested in our ISO 17025 accredited test lab under the most extreme conditions, NGK’s coil designs will outperform all others – far beyond operational environments a vehicle would actually experience. NGK ignition coils have vast coverage including late-model domestic and import vehicles. NGK’s OE legacy, unsurpassed quality and leading vehicles in operation coverage reinforces NGK as The Ignition Specialist.

Product Features:
  • OE QUALITY: Vacuum-sealed premium epoxy resin and thermoplastic coil housings provide superior dielectric strength, voltage insulation and durability
  • OPTIMAL PERFORMANCE: Precision coil windings and laminations maximize outputs, custom NGK ASIC chipset optimizes efficiency, prevents component damage
  • EASE OF INSTALLATION: NGK Ignition Coils include ignition control module, premium high temperature coil boot, and jumper harnesses where required
  • THE NGK DIFFERENCE: Featuring superior materials and design enhancements
  • EXTENSIVE TESTING: NGK ignition coils must pass extreme testing during manufacturing to ensure the highest quality and durability standards are met
  • PRODUCT ENGINEERING: Advanced flow and stress modeling systems preemptively identify and avoid common failure points found in OE and competitor coils
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Delphi – Ignition Coil (Part No.GN10322)

Ignition Coil

from

$44.49
Every single Delphi ignition coil is designed and endurance tested using high quality materials. This ensures fast starts, consistent engine performance and optimized fuel efficiency. We makes more than 10 million ignition coils for North America each year, and each one is engineered to OE design specifications for vehicles from Ford, Toyota, Nissan, Lexus, GM, Mazda, Chrysler, Subaru, Acura and more.

Product Features:
  • Delphi coils provide OE performance, durability and electromagnetic capacity level requirements
  • Delphi ignition coils are designed to insert power into spark plugs to ensure fast starts, consistent engine performance and optimized fuel efficiency
  • Delphi uses smart winding process techniques to controls wire lengths, keeping voltage the same
  • We manufacture our ignition coils with a high quality wire coating that resists imperfections that lead to failure
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ACDelco – Conventional Spark Plug (Part No.41-629)

Conventional Spark Plug

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$5.99
ACDelco GM Original Equipment Conventional Spark Plugs are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These Conventional Spark Plugs are designed for reliability and efficient performance, and are a high quality replacement for many vehicles on the road today. Their high-quality copper cores and outstanding suppression characteristics deliver reliable performance. They are also available for Marine applications. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco GM Original Equipment parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional.

Product Features:
  • Black Onyx coating helps reduce corrosion
  • Copper core provides great heat transfer and helps maximize plug durability
  • Ribbed suppressor seal extends resistance and helps prevent spark ‘flash over’ and misfires
  • Nickel-chrome alloy sheathing helps prevent corrosion on center electrode
  • Available for use in Marine applications
  • Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional
  • ACDelco GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies
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NGK – Iridium IX Spark Plug (BKR6EIX): Enhanced Ignitability & Durability (Part No.6418)

Iridium IX Spark Plug (BKR6EIX): Enhanced Ignitability & Durability

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$16.99
NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode’s durability is six times harder than platinum. Iridium alloy’s extremely high melting point is perfect for today’s engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.

Product Features:
  • SINGLE IRIDIUM TIP: Fine wire 0.6 millimeter iridium tip center electrode ensures high durability and a consistently stable spark
  • IRIDIUM ALLOY CENTER ELECTRODE: Iridium’s density (6x that of platinum) and extremely high melting point is perfect for modern high efficiency engines
  • TAPERED CUT GROUND ELECTRODE: Reduced quenching design produces outstanding ignitability, improved acceleration, fuel efficiency and durability
  • SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
  • TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
  • RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs
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E3 – DiamondFIRE Automotive Spark Plug: More Power & Fuel Efficiency (Part No.E3.64)

DiamondFIRE Automotive Spark Plug: More Power & Fuel Efficiency

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$8.49
The Premium DiamondFire Automotive Spark Plug is engineered to deliver peak performance and efficiency for your vehicle. Featuring E3’s patented Diamond Fire edge-to-edge ground electrode, it ensures a faster, more complete burn for smoother acceleration and idle. The innovative “diamond-shaped” side wire electrode enhances combustion by quickly igniting the air/fuel mixture, resulting in a larger and faster flame kernel. This translates to improved power output by up to 6% on average and significant fuel savings, while also reducing engine carbon deposits for a cleaner burn. Constructed with durable nickel for both the center and ground electrode tips, this spark plug is built to last. Its gasket seat type ensures a secure fit, and the pre-gapped design eliminates the need for adjustments, making installation hassle-free. Upgrade to this advanced spark plug for enhanced engine performance, better fuel efficiency, and a cleaner, more reliable ride.

Product Features:
  • E3’s Diamond Fire edge to edge ground electrode provides maximum performance with increased efficiency and a faster more complete burn
  • Smoother Acceleration & Idle – The faster flame initiated by the spark plug results in a more complete burn of the ingested fuel charge. More pressure is created against the piston more fuel is put to work
  • Energy – Power output improved up to 6% on average in the typical operating ranges. Results will vary.
  • Efficiency – The “diamond shaped” side wire electrode projects the combustion spark in a way that more quickly ignites the air/fuel mixture, thereby creating a significantly faster and larger flame kernel. The result is that more fuel is put to work durin
  • E3’s patented Diamond Fire Technology provides a cleaner burning combustion, which translates into fuel savings and reduced engine carbon deposits
  • The Spark Plugs are pre-gapped at the factory and cannot be adjusted.
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Champion – Platinum Power Spark Plug (RC12PMCB3): Powerful Performance & Longevity (Part No.3720)

Platinum Power Spark Plug (RC12PMCB3): Powerful Performance & Longevity

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$5.19
Champion Platinum Power spark plugs are engineered to deliver exceptional performance and durability, making them a reliable choice for maintaining your vehicle’s efficiency. Featuring a platinum center electrode, these spark plugs ensure long-lasting operation while resisting wear and maintaining the proper gap specification throughout their lifespan. The fine-wire center electrode enhances ignitability, while the V-trimmed ground electrode sharpens spark focus for optimal combustion. Constructed with the exclusive Heat-Active alloy, these plugs quickly reach and maintain the ideal operating temperature, ensuring consistent performance under various driving conditions. Designed as a standard replacement, they feature a flat seat type and a nickel-tipped ground electrode for added durability. With a built-in resistor, these spark plugs help reduce electromagnetic interference, making them a dependable choice for smooth engine operation. Upgrade to Champion Platinum Power spark plugs for a perfect balance of power, efficiency, and longevity.

Product Features:
  • Platinum Power- Premium Spark Plug. Powerful Performance.
  • Platinum center electrode for long life
  • Fine-wire center electrode for greater ignitability
  • V-trimmed ground electrode promotes sharper spark focus
  • Heat-Active alloy allows electrodes to reach optimal temperature
  • Platinum tipped center wire resists wear and helps to maintain proper gap spec over life of the plug
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Bosch – OE Fine Wire Double Platinum Spark Plug (Part No.8158)

OE Fine Wire Double Platinum Spark Plug

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$14.99
BOSCH Double Platinum Spark Plugs are engineered to deliver both performance and long life, representing the best of OE spark plug technology. BOSCH utilizes a platinum firing pin on the center electrode and platinum inlay in the ground electrode. This design reduces gap erosion, increases durability and performance life while meeting Original Equipment specifications for double platinum spark plugs.

Product Features:
  • Platinum on the center electrode firing pin and laser welded platinum inlay ground electrode provide 3 times longer life than conventional copper spark plugs.
  • OE Fine Wire design requires up to 24% less voltage to ignite
  • 360 degree continuous laser welding increases durability for increased life
  • Copper core provides broader heat range to resist pre-ignition and fouling
  • Pre-gapped and nickel plated threads allow for quick installation without adjusting the gap or applying anti-seize
  • Customer satisfaction guarantee (visit www.boschautoparts.com/sparkplugs for details)
  • Technician Warranty (visit www.boschautoparts.com/sparkplugs for details)
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DENSO – Iridium TT Spark Plug: Ultimate Endurance and Power, 0.4mm Iridium Tip, IK16TT (Part No.4701)

Iridium TT Spark Plug: Ultimate Endurance and Power, 0.4mm Iridium Tip, IK16TT

from

$12.99
Experience the perfect blend of durability and high performance with this spark plug, designed to deliver exceptional power and torque. Featuring a 0.4mm Iridium Center Electrode – the world’s smallest diameter – it maximizes firing potential, while the 0.7mm Needle Tip Ground Electrode enhances spark energy and minimizes heat quenching. Built with DENSO’s patented Iridium-Rhodium alloy formula, it boasts the highest concentration of Iridium for unmatched durability, enduring temperatures over 4000 Deg F. The advanced 360-degree laser welding process ensures a robust bond and structural integrity, while the Twin-Tip Technology combines a fine wire Iridium Center Electrode with a Needle Tip Platinum Ground Electrode for superior ignition. With over 100,000 miles of reliable performance, this plug enhances fuel economy, reduces emissions, and is crafted from premium materials for long-lasting endurance. Designed with a flat seat type, it offers OE-style reliability with the added benefits of cutting-edge engineering.

Product Features:
  • 0.4mm Iridium Center Electrode: World’s Smallest Diameter that maximizes firing potential
  • 0.7mm Needle Tip Ground Electrode: Promotes higher spark energy and less heat quenching
  • DENSO Patented Optimized Iridium-Rhodium Alloy Formula: Highest concentration of Iridium vs. competitors for greater durability
  • DENSO Patented 360 degree laser welding process: Ensuring exceptional quality bond and structural strength with the Iridium Center Electrode
  • Durability of an OE style plug combined with Power and Torque of high performance.
  • Withstands temperatures greater than 4000 degree Fahrenheit
  • Iridium TT
  • Ultimate Endurance and Power: The DENSO Iridium TT Spark Plug features a 0.7mm Iridium Tip, ensuring over 100,000 miles of uncompromised performance.
  • Advanced Twin-Tip Technology: Developed from Original Equipment Specification Super Ignition Plug (SIP) design, combining a Fine Wire Iridium Center Electrode with a Needle Tip Platinum Ground Electrode.
  • Enhanced Fuel Economy and Lower Emissions: Drive around the Earth over 4 times with improved fuel efficiency and reduced emissions.
  • Premium Materials: Features an Iridium Center Electrode Tip and a Flat Seat Type for optimal performance and durability.
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DENSO – Double Platinum Spark Plug: OE Performance, lasts 60K+ Miles, PK16R11 (Part No.3134)

Double Platinum Spark Plug: OE Performance, lasts 60K+ Miles, PK16R11

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$12.99
The Double Platinum Spark Plug is engineered to meet the highest OE standards for performance, durability, and emissions compliance. Featuring OE-grade platinum on both the center and ground electrodes, it ensures superior thermal conductivity and sustained spark performance for over 60,000 miles. Its premium shell construction with machine-rolled threads enhances durability and ensures a secure fit, while the flat seat type provides reliable sealing. Designed to reduce secondary required voltage, this spark plug increases ignition efficiency, delivering smoother engine performance and fewer misfires. The double platinum design not only boosts longevity but also minimizes maintenance, making it a cost-effective choice for drivers. With its proven reliability, this spark plug helps reduce shop comebacks, ensuring customer satisfaction and peace of mind.

Product Features:
  • OE grade platinum on both center and ground electrodes
  • Premium shell construction with machine-rolled threads
  • Superior thermal conductivity
  • Sustained spark performance over 60,000 miles
  • Reduced secondary required voltage, increased ignition efficiency
  • Satisfied customers, reduced shop comebacks
  • Double Platinum
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NGK – Laser Iridium Spark Plug (IFR6Q-G): Fine Wire Tip for Precision (Part No.5648)

Laser Iridium Spark Plug (IFR6Q-G): Fine Wire Tip for Precision

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$21.99
NGK Laser Iridium spark plugs offer the best combination of performance and longevity. Engineered specifically for OE applications, Laser Iridium spark plugs are tested to the highest standards to ensure quality and durability. Iridium tipped center electrode provides durability six times harder than platinum. NGKs high grade pure alumina ceramic and 98 percent pure copper core prevents the spark plug from overheating while providing reliable starts. Most Laser Iridium spark plugs feature a platinum pad on the ground electrode for even wear in distributorless ignition systems.

Product Features:
  • ACTUAL OE or EQUIVALENT DESIGN: OEM quality construction fine wire iridium alloy center electrode provides consistent performance
  • IRIDIUM ALLOY CENTER ELECTRODE: Iridium’s density (6x that of platinum) and extremely high melting point is perfect for modern high efficiency engines
  • PLATINUM TIP GROUND ELECTRODE: Unless OE specified, platinum protection at the ground electrode provides excellent ignitability and service life
  • SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
  • TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
  • RECOMMENDED USAGE: Best for vehicles with OE fine wire iridium alloy plugs
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DENSO – Double Platinum Spark Plug: OE Performance, lasts 60K+ Miles, PK20PR-L11 (Part No.3142)

Double Platinum Spark Plug: OE Performance, lasts 60K+ Miles, PK20PR-L11

from

$11.99
The Double Platinum Spark Plug is engineered to meet the highest OE standards for performance, durability, and emissions compliance. Featuring OE-grade platinum on both the center and ground electrodes, it ensures superior thermal conductivity and sustained spark performance for over 60,000 miles. Its premium shell construction with machine-rolled threads provides a secure fit and long-lasting reliability, while the flat seat type ensures optimal compatibility. Designed to reduce secondary required voltage, this spark plug enhances ignition efficiency, delivering smoother engine performance and fewer misfires. The double platinum design not only boosts durability but also minimizes maintenance needs, making it a trusted choice for satisfied customers and reducing shop comebacks. Built for those who demand excellence, this spark plug offers exceptional value and dependable performance for the long haul.

Product Features:
  • OE grade platinum on both center and ground electrodes
  • Premium shell construction with machine-rolled threads
  • Superior thermal conductivity
  • Sustained spark performance over 60,000 miles
  • Reduced secondary required voltage, increased ignition efficiency
  • Satisfied customers, reduced shop comebacks
  • Double Platinum
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Upgrade your 2021 Audi A4 Quattro with Top-Quality Ignition and Tune-Up Products

When it comes to maintaining or upgrading your 2021 Audi A4 Quattro, 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, Ignition and Tune-Up Products are key to keeping your A4 Quattro functioning at its best. At Advance Auto Parts, we offer a wide selection of 6 Ignition and Tune-Up Products for the 2021 Audi A4 Quattro, designed to meet your needs without breaking the bank. From Spark Plug replacements to Ignition 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 Ignition and Tune-Up Products for any vehicle can be a hassle, especially if you’re on a budget. But with Advance Auto Parts, you can find high-quality Ignition and Tune-Up Products for your 2021 Audi A4 Quattro at great prices. Our Ignition and Tune-Up Products inventory for this model ranges from just $12.49 to $87.99, with an average price of $53.24. Our 6 Ignition and Tune-Up Products in stock come from 3 trusted brands, so you’re sure to find the right part for your 2021 Audi A4 Quattro 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 Ignition and Tune-Up Product upgrades. Explore related part types like Batteries and Chargers, Oil and Lubricants and more to make sure your 2021 Audi A4 Quattro is always ready to roll. We’re committed to providing you with everything you need to keep your A4 Quattro in top shape, all in one place. Start shopping confidently below for your 2021 Audi A4 Quattro!

Best-Selling Spark Plugs for 2021 Audi A4 Quattros

Enhance the driving experience in your Audi with 1 quality Spark Plug components, starting at $12.99.

Bosch – EVO Spark Plug: Reliable Ignition & Long Service Life (Part No.8501)

EVO Spark Plug: Reliable Ignition & Long Service Life

from

$12.99
BOSCH EVO spark plugs are engineered to ensure reliable ignition throughout its long service life even under extreme conditions in modern engines. Thanks to its improved insulator design and high dielectric strength (greater than 45 kV), the new EVO spark plugs can withstand irregular combustion – known as mega knocking – that can occur in modern, technologically advanced engines. BOSCH EVO spark plugs are developed and produced with the same high quality as original equipment spark plugs. Today’s turbocharged gasoline direct injection engines place high demands on spark plugs – the new BOSCH EVO meets these needs.

Product Features:
  • Thermomechanical strength: Improved insulator design features provide greater resistance to irregular burns and mega-knocking.
  • Mechanical strength: Improved design features on the insulator and housing increase the head bending strength, reducing risk of damage during installation and optimizing gas seal tightness in the cylinder head
  • Electrical strength: Improved design features on the insulator increase the dielectric strength (45kV)
  • Long service life: The iridium alloy in the firing pin of the center electrode and platinum-iridium alloy on the ground electrode reduces the wear on the electrodes and increases the service life of the spark plug
  • Corrosion defense: Improved corrosion protection through the use of a process developed by Bosch for nickel coating of the spark plug housing
  • Important: Always torque to the proper specification using a torque wrench
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Most Popular 2021 Audi A4 Quattro Ignition Sensors

Customize your Audi with 1 Ignition Sensors products like Knock Sensors, all priced under $87.99.

Carquest Premium – Ignition Knock (Detonation) Sensor (Part No.EKA1053)

Ignition Knock (Detonation) Sensor

from

$87.99
Carquest Premium knock sensors are designed to perform in harsh engine environments and meet or exceed original equipment (O.E.) specifications. Carquest Premium knock sensors are built by manufacturers that meet IATF 16949 certified framework, an internationally recognized proof of quality in the automotive industry. We utilize advanced technology to design sensors that are, in many cases, stronger than OE parts. Carquest Premium knock sensors undergo extensive validation testing to ensure long-lasting performance and reliability. Carquest Premium knock sensors are part of our Carquest Vehicle Solutions, which is a full line of engine management and electronics products that help control ignition, fuel delivery and emission systems. Carquest Vehicle Solutions are OE-quality parts designed, engineered and tested by world-class manufacturers to ensure a reliable and long-lasting repair.

Product Features:
  • Designed to meet or exceed OE specifications for fit, form and function
  • Trivalent iridescent chromate plating prevents corrosion
  • Silicone seals prevent moisture intrusion preventing false codes and sensor failure
  • Wiring harnesses utilize high-temperature insulation when applicable
  • Extensive design validation testing and 100% end-of-line tested
  • Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
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Top Picks for 2021 Audi A4 Quattro Ignition Coils and Boots

Upgrade Audi A4 Quattros with top-quality Ignition Coils and Boots parts, including 4 OEM and aftermarket selections for your 2021 model.

Delphi – Ignition Coil (Part No.GN10632)

Ignition Coil

from

$75.99
Every single Delphi ignition coil is designed and endurance tested using high quality materials. This ensures fast starts, consistent engine performance and optimized fuel efficiency. We makes more than 10 million ignition coils for North America each year, and each one is engineered to OE design specifications for vehicles from Ford, Toyota, Nissan, Lexus, GM, Mazda, Chrysler, Subaru, Acura and more.

Product Features:
  • Delphi coils provide OE performance, durability and electromagnetic capacity level requirements
  • Delphi ignition coils are designed to insert power into spark plugs to ensure fast starts, consistent engine performance and optimized fuel efficiency
  • Delphi uses smart winding process techniques to controls wire lengths, keeping voltage the same
  • We manufacture our ignition coils with a high quality wire coating that resists imperfections that lead to failure
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Carquest Premium – Ignition Coil (Part No.EBC1114)

Ignition Coil

from

$65.99
Carquest Premium ignition coils meet or exceed original equipment (OE) specifications and are developed by top OE/OES manufacturers to ensure superior performance. All of our Carquest Premium ignition coils are developed by IATF 16949 certified manufacturers for consistent durability and long-lasting performance. These ignition coils use high-quality components and will utilize optimized designs on applications where the OE ignition coil had frequent failures. We require stringent testing standards to ensure proper fit and performance for each application and stand behind our Carquest Premium ignition coils with an industry-leading warranty. Carquest Premium ignition coils are part of our Carquest Vehicle Solutions, which is a full line of engine management and electronics products that help control ignition, fuel delivery and emission systems. Carquest Vehicle Solutions are OE-quality parts designed, engineered and tested by world-class manufacturers to ensure a reliable and long-lasting repair.

Product Features:
  • Built by IATF 16949 certified manufacturers for consistent durability
  • Coil drivers match OE for current limit, electrostatic discharge (ESD) protection and multi-spark
  • Segmented secondary bobbins to distribute high voltage and prevent shorting
  • 100% end-of-line tested to ensure proper performance
  • Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
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Carquest Premium – Ignition Coil (Part No.EBC1291)

Ignition Coil

from

$63.99
Carquest Premium ignition coils meet or exceed original equipment (OE) specifications and are developed by top OE/OES manufacturers to ensure superior performance. All of our Carquest Premium ignition coils are developed by IATF 16949 certified manufacturers for consistent durability and long-lasting performance. These ignition coils use high-quality components and will utilize optimized designs on applications where the OE ignition coil had frequent failures. We require stringent testing standards to ensure proper fit and performance for each application and stand behind our Carquest Premium ignition coils with an industry-leading warranty. Carquest Premium ignition coils are part of our Carquest Vehicle Solutions, which is a full line of engine management and electronics products that help control ignition, fuel delivery and emission systems. Carquest Vehicle Solutions are OE-quality parts designed, engineered and tested by world-class manufacturers to ensure a reliable and long-lasting repair.

Product Features:
  • Built by IATF 16949 certified manufacturers for consistent durability
  • Coil drivers match OE for current limit, electrostatic discharge (ESD) protection and multi-spark
  • Segmented secondary bobbins to distribute high voltage and prevent shorting
  • 100% end-of-line tested to ensure proper performance
  • Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
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Carquest Premium – Coil On Plug Insulator Boot: Spring included, Designed for direct fit (Part No.35-7176)

Coil On Plug Insulator Boot: Spring included, Designed for direct fit

from

$12.49
Carquest Premium spark plug boots are engineered to restore ignition boot reliability and performance. They are designed to meet or exceed original equipment (O.E.) specifications for fit, form and function. Our spark plug boots offer excellent heat resistance as well as maximum protection against spark loss. Carquest Premium spark plug boots are built with a durable silicone compound for resistance to high heat and abrasion, resulting in a longer-lasting ignition repair.

Product Features:


Product Features:
  • OE design provides an exact fit for your application
  • Provides excellent heat resistance as well as maximum protection against spark loss
  • Durable silicone compound for resistance to high heat or abrasion
  • Spring included with the spark plug boot
  • Design for direct compatibility
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FAQs for 2021 Audi A4 Quattro Ignition and Tune-Up Products

Which Ignition and Tune-Up Products are best-sellers for 2021 Audi A4 Quattros?

Out of 6 Ignition and Tune-Up Products that fit 2021 Audi A4 Quattros, the following parts are the top sellers:

What’s the price range for 2021 Audi A4 Quattro Ignition and Tune-Up Products?

Ignition and Tune-Up Product prices for the 2021 Audi A4 Quattro start at $12.49 and go up to $87.99 for the most premium parts.

What’s the average price of a Ignition and Tune-Up Product for a 2021 Audi A4 Quattro?

The average price for Ignition and Tune-Up Products for the 2021 Audi A4 Quattro is $53.24. Keep in mind the variety of part types within our Ignition and Tune-Up Product category so you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Ignition and Tune-Up Products for other Audi A4 Quattro model years?

Yes, we currently carry Ignition and Tune-Up Products for 28 model years of Audi A4 Quattros between 1996 and 2025. Ignition and Tune-Up Products are bought most frequently for the following model years: 2022, 2020, 2019, 2018, 2017, 2016, 2015, 2014, and 2013.

What are the cheapest Ignition and Tune-Up Products for my 2021 Audi A4 Quattro?

The cheapest 2021 Audi A4 Quattro Ignition and Tune-Up Products we carry in stock are:

What types of Ignition and Tune-Up Products do you sell for my 2021 Audi A4 Quattro?

As of 3/1/26, these are some of the most in-demand types of Ignition and Tune-Up Products for a 2021 Audi A4 Quattro:

Can I get help with 2021 Audi A4 Quattro Ignition and Tune-Up Product orders?

Contact our customer support team, by chat or phone, through the help desk page, where you can find instant answers about Audi Ignition and Tune-Up Products and more.

What is your return policy for Audi A4 Quattro Ignition and Tune-Up Products?

Advance Auto Parts keeps returns simple. For new Audi A4 Quattro Ignition and Tune-Up Products and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.