2003 Infiniti QX4 Fuel and Emissions Systems

Essential 2003 Infiniti QX4 Fuel and Emissions Systems

Dorman – Fuel Filler Neck Coated To Prevent Rust (Part No.577-944)

Fuel Filler Neck Coated To Prevent Rust

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$148.99
Fuel filler neck leaking? This replacement fuel filler neck is precision-engineered and thoroughly tested to match the original filler neck for specific vehicle years, makes and models for a reliable repair.

Product Features:
  • Direct replacement – this fuel filler neck is made to match the original equipment on specific vehicles
  • Durable construction – made of corrosion-resistant materials to reduce future failure potential
  • Regulatory compliant – built to meet emission and inspection standards
  • Trustworthy value – backed by team of engineers and quality control experts in the United States
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Carquest Premium – Multi Purpose Relay (Part No.RAA2713)

Multi Purpose Relay

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$40.99
Carquest premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
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Spectra Premium – Fuel Pump (Part No.SP1118)

Fuel Pump

from

$119.99
CARQUEST enhanced electric in-tank fuel pumps are 100% quality tested and are designed to deliver quiet operation, industry-leading performance and durability. All CARQUEST pumps meet or exceed OE specifications in fit, form and function.

Product Features:
  • Every single pump is 100% tested throughout the entire manufacturing process for worry free, out-of-the-box performance
  • Advanced polymers, brushes and commutators to ensure long life and durability in multiple fuel blends.
  • High-performance pump section assembly provides superior performance
  • Leading-edge inlet design to increase performance and efficiency, leading to longer life
  • High grade outer shell for life-long corrosion resistance
  • Optimized, precision-wound armature assembly for increased performance
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Carquest Premium – Fuel Cap Tester Adapter (Part No.12422)

Fuel Cap Tester Adapter

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$39.99
Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.

Product Features:
  • BAR Certified adapters
  • Adapter check’s a fuel cap’s ability to hold pressure.
  • Adapters meet EPA standards for recommended fleet coverage.
  • Check adapter application chart for specific makes and models
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Delphi – Fuel Tank Cleaning Kit (Part No.FC01)

Fuel Tank Cleaning Kit

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$12.49
To perform a complete fuel pump replacement, clean the tank every time. Order the Delphi Fuel Tank Cleaning Kit (Part FC01). Remember, the original pump went into a clean fuel tank, to ensure the same level of performance, the new pump should too. 100 ye

Product Features:
  • Helps avoid premature fuel pump failure
  • Lint free towel included
  • Low suds formulation
  • Removes harmful contaminants from the fuel tank
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Elring – Fuel Injector Seal (Part No.C1010681908ELR)

Fuel Injector Seal

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$2.43
Fuel Injector Seal

Ishino Stone – Throttle Body Gasket (Part No.C7001320500ISH)

Throttle Body Gasket

from

$2.31
Throttle Body Gasket

Carquest Premium – Fuel Pump Strainer FS2321774 (Part No.FS2321774)

Fuel Pump Strainer FS2321774

from

$23.99
CARQUEST Premium electric fuel pumps are built to meet or exceed Original Equipment (OE) specifications for fit, form and function. Our CARQUEST Premium fuel pumps are built to be installed in the Original Equipment module or assembly. We have invested in industry-leading quality upgrades, like upgraded turbine impellers and 100% carbon commutators, to deliver greater reliability. CARQUEST Premium electric fuel pumps are engineered with superior quality components to provide the longest life and reliable performance.

Product Features:
  • Meets or exceeds OE specifications for fit, form and function
  • 100% carbon commutators provide resistance to aggressive fuels and double the life expectancy of the pump
  • OE upgraded turbine impellers greatly reduce fuel pulsation
  • All fuel pumps are 100% performance tested
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Carquest Premium – Fuel Pump Tank Seal TS3541966 (Part No.TS3541966)

Fuel Pump Tank Seal TS3541966

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$6.49
Carquest Premium offers a complete line of fuel pump tank seals covering a wide variety of North American vehicle applications. Carquest Premium fuel pump tank seals are engineered to meet or exceed all OEM specifications.

Product Features:
  • Engineered to meet or exceed all OEM specifications
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Carquest Premium – Reman Multi Port Fuel Injector (Part No.A218-1244)

Reman Multi Port Fuel Injector

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$56.99
Product Features:
  • Each unit is 100% tested to OE specifications.
  • Includes new o-rings and seals made of premium OE quality materials.
  • Includes application specific technical bulletin, where applicable.
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Carquest Premium – Fuel Injector Connector (Part No.PTA1064)

Fuel Injector Connector

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$4.29
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
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NTK – NTK Oxygen Sensor (Part No.C5010381301NTK)

NTK Oxygen Sensor

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$234.47
NTK is the world’s largest supplier and manufacturer of original equipment oxygen sensors. NTK oxygen sensors meet or exceed original equipment specifications and are equipped with waterproof factory fitted connectors to ensure a perfect fit every time. Every NTK oxygen sensor is individually tested to ensure the highest level of quality and reliability.

Product Features:
  • OE-Equivalent.
  • Direct fit for easy installation.
  • Extensively Tested During Manufacture to Guarantee Quality and Reliability
  • Supplied With a Factory-Fitted OEM Connector for Easy Installation
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Carquest Premium – Air Charge Temperature Sensor (Part No.WTA1183)

Air Charge Temperature Sensor

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$30.99
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
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Carquest Premium – Vapor Canister Purge Solenoid (Part No.CPC1055)

Vapor Canister Purge Solenoid

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$87.99
Carquest premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
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Wells Vehicle Electronics – Fuel Injection Pressure Regulator (Part No.5G1155)

Fuel Injection Pressure Regulator

from

$79.99
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
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Niles – Ambient Temp Sensor (Part No.P4025778656NIL)

Ambient Temp Sensor

from

$28.46
Ambient Temp Sensor

Ishino – Fuel Rail Insulator (Part No.C1008251685ISH)

Fuel Rail Insulator

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$1.84
Fuel Rail Insulator

Nippon Reinz – Fuel Injector O-Ring (Part No.C1012251347NRZ)

Fuel Injector O-Ring

from

$3.39
NIPPON REINZ engineers work with OEMs to develop complete engine sealing solutions for gasoline, diesel, and alternative energy vehicles. We employ custom sealing solutions through our expert problem solving utilizing our regional research and development centers. As an Integral Partner with Virtually Every major vehicle and engine manufacturer worldwide, NIPPON REINZ offers a comprehensive range of sealing Innovative Systems, INCLUDING Head gaskets, Heat shields, sealing modules, secondary gaskets, Valve stem Seals, and transmission components.
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DENSO – Oxygen Sensor: Upstream, 3 Wire, 36.61" Long, Heated, Exact Fit (Part No.234-3097)

Oxygen Sensor: Upstream, 3 Wire, 36.61" Long, Heated, Exact Fit

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$78.99
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:
  • 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
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Carquest Premium – Locking Fuel Cap: 10512, Screw On, Direct Fit, Provides Tight Seal, 1 Pack (Part No.10512)

Locking Fuel Cap: 10512, Screw On, Direct Fit, Provides Tight Seal, 1 Pack

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$24.99
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:
  • Protects your fuel from theft and vandalism
  • Passes all state and federal emissions tests
  • Manufactured from durable, long-life materials
  • Reduces air pollution with proper sealing and venting
  • Independently tested for emission control
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Hitachi – Idle Air Control Valve New Actual OE Part (Part No.ABV0043)

Idle Air Control Valve New Actual OE Part

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$137.99
Hitachi’s Air Bypass Valves (ABVs) is designed to accurately regulate the amount of air entering the engine when at idle (also known as an Idle Speed Control (ISC) Valve and Idle Air Control (IAC) Valve). High quality materials ensure that even under the most extreme conditions, Hitachi’s ABVs will not deform or malfunction. Our ABVs 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 OE manufacturer which makes Hitachi’s ABVs the premium choice. The Hitachi designed air bypass valves have precise response time and flexible flow capability to maintain constant system pressure. They create a safer driving experience by suppressing backfire during deceleration and virtually eliminating the chance of hydro-lock. Hitachi is a Tier One OE supplier to the largest automobile manufacturers globally, delivery industry leading quality, and exceeding customer expectations with our products and service. Hitachi is bringing that same knowledge and expertise to the premium products we deliver in the Aftermarket because Quality Matters.

Product Features:
  • 100% air flow tested for ideal performance 
  • 100% NEW, never remanufactured 
  • Hitachi is a Tier 1 OE supplier for air bypass valves 
  • Meets the OE performance and durability standards for this application 
  • O-Ring/Gasket included when applicable 
  • Precision machined moving components and contact surfaces with a durable cast aluminum body 
  • Restores original drivability characteristics 
  • Quick response Time; Flexible flow capability and low current draw.
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Spectra Premium – Fuel Tank Strap (Part No.ST359)

Fuel Tank Strap

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$80.99
Innovative engineering, manufacturing technology and quality control ensure that Spectra Premium fuel tank straps meet or exceed the performance of the original equipment they replace.

Product Features:
  • Unit is designed to OE fit, form and function requirements accomplished by leveraging our expertise
  • Direct fit ensures safe, secure fuel tank installation
  • Product individually packaged and labeled to help reduce product damage prior to installation
  • Industry leading coverage on straps for plastic tanks
  • Manufactured with double-layered steel on the mounting brackets for a more robust solution
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Hitachi – Air Flow Sensor – New Actual OE Part (Part No.MAF0024)

Air Flow Sensor - New Actual OE Part

from

$343.99
Hitachis 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 Hitachis air flow sensors the premium choice.

Product Features:
  • Hitachi is a Tier 1 OE supplier for air flow sensors
  • 100% NEW, never remanufactured
  • Hitachi’s advanced precision elements and high quality components provide enhanced durability. We feature exact fitment and calibration for each vehicle, which assists engine efficiency and fuel mileage. Our sensors are 100% air flow tested to meet exac
  • Precision manufactured and assembled sensing elements for accurate air flow measurements
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Victor Reinz – Fuel Injector O-Ring Kit (Part No.18-10027-01)

Fuel Injector O-Ring Kit

from

$8.79
With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.

Product Features:
  • Choosing Victor Reinz assures getting OE quality parts in gaskets sets that have the coverage, contents, packaging and electronic cataloging to best meet the needs of the aftermarket.
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Carquest Premium – Coolant Temp Switch (Part No.ECA1919)

Coolant Temp Switch

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$193.99
The CarQuest Vehicle Solutions line of vehicle electronics are designed for OE form, fit and function for both import and domestic vehicles. The Coolant Temperature Switch monitors the temperature of the engine’s coolant, activating fans at factory designated temperature set-points ensuring proper engine temperature levels and peak engine performance are maintained.

Product Features:
  • Made to OE spec to ensure a proper fit, form and function.
  • Sensors are engineered for precision performance, durability and a long service life.
  • Designed and manufactured with quality materials, industry leading electronic components and strict quality controls. Engineered to meet OE performance.
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Carquest Premium – Fuel Injector Seal Kit (Part No.AS027)

Fuel Injector Seal Kit

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$9.49
CARQUEST fuel injector seal kits include the necessary O-rings and seals to properly reseal the injector, which is a recommended practice any time the injector is removed. Each kit services one injector and includes hard to find or previously dealer-only components.

Product Features:
  • Premium OE quality materials
  • Services one injector
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Dorman – Splash Shield Retainer (Part No.700-657CD)

Splash Shield Retainer

from

$1.99
Constructed of quality materials, this multi-purpose retainer provides the same function and versatility as the original equipment retainer ensuring long service life.

Product Features:
  • Ideal replacement – this retainer matches the fit and function of the original equipment retainer for this vehicle application
  • Quality material – this retainer is made of durable material for long-lasting service
  • Versatile design – this retainer is suitable for a variety of automotive uses
  • Excellent value – this part offers original equipment quality at a competitive cost
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Carquest Premium – Exhaust Gas Recirculation (EGR) Vacuum Regulator Solenoid Connector (Part No.PTA2918)

Exhaust Gas Recirculation (EGR) Vacuum Regulator Solenoid Connector

from

$149.99
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
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2003 Infiniti QX4 Fuel and Emissions Systems

You count on your 2003 Infiniti QX4 to run right. That means taking care of it with regular maintenance, necessary repairs, and the right parts. Advance Auto Parts can help with all of that thanks to our extensive inventory of trusted Fuel and Emissions Systems. With 84 Fuel and Emissions Systems ranging in price from $1.84 to $448.99, you’re sure to find everything you need for your 2003 Infiniti QX4.

Brands matter. If you want to shop a specific Fuel and Emissions Systems brand, we stock 22 different brands like Carquest Premium, Motorad, and Delphi. 2003 Infiniti QX4 Fuel and Emissions Systems start as low as $1.84!

One of the best ways to find top quality OEM or aftermarket Fuel and Emissions Systems is by asking professionals. Short of that, you can shop with confidence thanks to our 337 extensive product reviews on 2003 Infiniti QX4 Fuel and Emissions Systems. Some of the top-rated Fuel and Emissions Systems products we carry are Oxygen Sensor: 4 Wire, 24.02" Long, Heated, Exact Fit with 3.8 stars and Oxygen Sensor: 3 Wire, 24.02" Long, Heated, Universal with 3.9 stars.

Did we mention you can order your Fuel and Emissions Systems from our online catalog and have them shipped right to your garage? Or, if you feel like seeing the parts first-hand, search for your nearest Advance Auto Parts location above and pick up in-store when you’re ready. Browse our full Fuel and Emissions Systems inventory for your 2003 Infiniti QX4 below to get started!

Top-Rated Fuel and Emissions Systems Brands For Your 2003 Infiniti QX4

Trusted Fuel and Emissions Systems OEM and aftermarket product brands are what Advance Auto Parts specializes in. The brands we work with are sure to keep that 2003 Infiniti QX4 running right for years to come. In our inventory you’ll find brands like Carquest Premium, Motorad, Delphi, and even more.

Popular Bosch Fuel and Emissions Systems

You’ll find popular Bosch brand products across Oxygen Sensors. All are waiting to get your 2003 Infiniti QX4 back on the road. Some of the top-rated Bosch products in these categories are:

Top-Rated Carquest Premium Fuel and Emissions Systems


If Carquest Premium are what you’re looking for, our inventory holds plenty. We stock Carquest Premium brand Fuel and Emissions Systems for your 2003 Infiniti QX4, and some of our most reviewed Carquest Premium parts include:
Fuel Cap
from $17.79
(40)
Fuel Cap
Gas Caps

FAQs for 2003 Infiniti QX4 Fuel and Emissions Systems

What are the most purchased Fuel and Emissions Systems for the 2003 Infiniti QX4?

Out of 84 Fuel and Emissions Systems for the 2003 Infiniti QX4, the most popular in our inventory are:
Tethered Fuel Cap
from $25.99
This product is not rated
Tethered Fuel Cap
Gas Caps
Fuel Tank Cleaning Kit
from $12.49
This product is not rated
Fuel Tank Cleaning Kit
Fuel Tank Cleaning Kits

What are the top-rated 2003 Infiniti QX4 Fuel and Emissions Systems?

Top-rated Fuel and Emissions Systems for your 2003 Infiniti QX4 based on customer reviews/ratings are:
Oxygen Sensor: 4 Wire, 24.02" Long, Heated, Exact Fit
from $69.99
(8)
Oxygen Sensor: 4 Wire, 24.02" Long, Heated, Exact Fit
“Very east to connected”
Oxygen Sensor: 3 Wire, 24.02" Long, Heated, Universal
from $69.99
(7)
Oxygen Sensor: 3 Wire, 24.02" Long, Heated, Universal
“Comes with plenty enough instructions with pictures.Its a Bosch so really nothing else to say. I personally think they are the best for imports if you”
Air Flow Sensor - New Actual OE Part
from $244.99
(6)
Air Flow Sensor – New Actual OE Part
“Works!”