2004 Subaru WRX Emission Control

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    • Bosch® Premium Oxygen Sensor
      (0 reviews)
      # 35994372
      Subaru WRX 2004, Premium Oxygen Sensor by Bosch®. Location: Downstream. A worn-out oxygen sensor can cause engine performance problems and shorten the life of the catalytic converter. Tune-up your vehicle with an Oxygen Sensor...
      Up to 15 % savings in fuel costsReduced CO2 emissions
      $62.58
    • Bosch® Wideband Oxygen Sensor
      (0 reviews)
      # 35994368
      Subaru WRX 2004, Wideband Oxygen Sensor by Bosch®. Location: Upstream. This sensor utilizes a sophisticated sensing element enabling it to produce a precise output in proportion to the air/fuel ratio. The A/F sensor measures...
      Detects the exact amount of unburned fuel in the exhaust streamOE connectors and OE-style harness for continuous wire from connector to sensor
      $145.22 - $186.24
    • Standard® Oxygen Sensor
      (1 reviews)
      # 45000611
      Subaru WRX 2004, Oxygen Sensor by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the highest reputation for...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $27.05 - $127.09
    • Delphi® Oxygen Sensor
      (0 reviews)
      # 24591162
      Subaru WRX 2004, Oxygen Sensor by Delphi®. Connector Type: Square-4 Blade. Wrench Size: 7/8". As one of the leading suppliers of oxygen sensor technology since 1978, Delphi planar technology is the result of their OE and...
      OE connectors and wire lengths within three inches of OE specificationsResists high temperatures, vibration damage and wire corrosion to protect signal accuracy, and long life
      $59.64 - $181.06
    • NTK® Replacement Oxygen Sensor
      (0 reviews)
      # 22131767
      Subaru WRX 2004, Replacement Oxygen Sensor by NTK®. This product is designed to improve engine efficiency and fuel mileage, while reducing emissions and extending catalyst life. The oxygen sensor is made of premium quality material...
      Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement
      $74.94
    • Hitachi® Oxygen Sensor
      (0 reviews)
      # 22063980
      Subaru WRX STI 2004, Oxygen Sensor by Hitachi®. This is an aftermarket part that replaces factory OE # 22690AA640. This sensor is manufactured using the latest electronic-sensing technology to ensure accurate measurement of the...
      Ensures precise measurement of exhaust gas oxygen contentMeets or exceeds OE specifications
      $178.60
    • Denso® Downstream OE Connector Oxygen Sensor
      (0 reviews)
      # 21104200
      Subaru WRX / WRX STI 2004, Downstream OE Connector Oxygen Sensor by Denso®. Heated. 4 Wires, 21.26" / 54.00 cm Length. Denso's light duty oxygen sensor started to appear on vehicles with the development of fuel injection systems....
      Corrosion-resistant stainless steel constructionPTFE filter blocks efficiency-robbing contaminants
      $51.88
    • Standard® Intermotor™ Vapor Canister
      (0 reviews)
      # 45115639
      Subaru WRX / WRX STI 2004, Intermotor™ Vapor Canister by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $74.93
    • Bosch® Universal Fit Oxygen Sensor
      (0 reviews)
      # 35994425
      Subaru WRX / WRX STI 2004, Universal Fit Oxygen Sensor by Bosch®. Location: Downstream. Properly functioning oxygen sensors are important when it comes to your vehicle's fuel efficiency and reducing harmful exhaust emissions....
      Up to 15 % savings in fuel costsReduced CO2 emissions
      $40.94
    • BTP® PCV Valve
      (0 reviews)
      # 66960259
      Universal PCV Valve by BTP®. Designed utilizing the latest technology, this product delivers the performance you've been looking for. With this second-to-none part by BTP you will keep emission control system in your vehicle...
      Designed for better performance of your emission control systemRight for your vehicle and lifestyle
      $19.89
    • BTP® Evacuation System
      (0 reviews)
      # 66967865
      Universal Evacuation System by BTP®. Designed utilizing the latest technology, this product delivers the performance you've been looking for. With this second-to-none part by BTP you will keep emission control system in your...
      Designed for better performance of your emission control systemRight for your vehicle and lifestyle
      $4.87 - $34.75
    • BTP® Smog PCV Tube
      (0 reviews)
      # 66967993
      Universal Smog PCV Tube by BTP®. Designed utilizing the latest technology, this product delivers the performance you've been looking for. With this second-to-none part by BTP you will keep emission control system in your vehicle...
      Designed for better performance of your emission control systemRight for your vehicle and lifestyle
      $1.51 - $2.13
    • BTP® Grommet
      (0 reviews)
      # 69343097
      Universal Grommet by BTP®. Designed utilizing the latest technology, this product delivers the performance you've been looking for. With this second-to-none part by BTP you will keep emission control system in your vehicle working...
      Designed for better performance of your emission control systemRight for your vehicle and lifestyle
      $0.62 - $0.66
    • Standard® Intermotor™ Vapor Canister Vent Solenoid
      (0 reviews)
      # 45115640
      Subaru WRX / WRX STI 2004, Intermotor™ Vapor Canister Vent Solenoid by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $55.65
    • Standard® Intermotor™ Vapor Canister Purge Solenoid
      (0 reviews)
      # 45264031
      Subaru WRX 2004, Intermotor™ Vapor Canister Purge Solenoid by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $86.51 - $109.56
    • Accel® Gen VII™Linear Oxygen Sensor
      (0 reviews)
      # 12710299
      Universal Gen VII™Linear Oxygen Sensor by Accel®. No matter what vehicle you own, its ignition system is what helps to achieve the mileage and power you bought it for. Quality ignition system components are a sure way to let your...
      The finest quality at a great priceImproves your engine's performance
      $87.54 - $1,159.73
    • Ishino® Crankcase O-Ring
      (0 reviews)
      # 8300803
      Subaru WRX 2004, Crankcase O-Ring by Ishino®.Is your vehicle feeling down on power? Do you see dark puddles on the ground when you park? Is your CHECK ENGINE light on? Your engine may be in need of repair, but before you waste your...
      $3.29 - $5.47
    • Walker Products Inc.® OE Connector Oxygen Sensor
      (0 reviews)
      # 8739924
      Subaru WRX / WRX STI 2004, OE Connector Oxygen Sensor by Walker Products Inc.®. Position: Rear. Is your CHECK ENGINE light on? Has your vehicle failed a state emissions test? Your vehicle’s emissions control system is in need of...
      $90.89
    • Genuine® Carbon Canister
      (0 reviews)
      # 8798136
      Subaru WRX / WRX STI 2004, Carbon Canister by Genuine®. Is your CHECK ENGINE light on? Has your vehicle failed a state emissions test? Your vehicle’s emissions control system is in need of repair, but before you waste your time...
      $122.21
    • Genuine® Purge Valve
      (0 reviews)
      # 8804939
      Subaru WRX / WRX STI 2004, Purge Valve by Genuine®. Note: Located Next to Intake Manifold. Is your CHECK ENGINE light on? Has your vehicle failed a state emissions test? Your vehicle’s emissions control system is in need of...
      $47.51
    • Genuine® EGR Vacuum Solenoid
      (0 reviews)
      # 44711906
      Subaru WRX 2004, EGR Vacuum Solenoid by Genuine®. Position: Right. Also Known As Duty Solenoid. Is your CHECK ENGINE light on? Has your vehicle failed a state emissions test? Your vehicle’s emissions control system is in need of...
      $171.51
    • Powerbuilt® Oxygen Sensor Socket Kit
      (0 reviews)
      # 16795834
      Oxygen Sensor Socket Kit - Kit #51 by Powerbuilt®. For removing and installing oxygen sensor sockets. Special cut-out design on sockets prevents damage to wire leads.
      Made with precision and quality in mindDesigned to meet your specific needs
      $21.50
    • Powerbuilt® Master Sensor Socket Kit
      (0 reviews)
      # 16795870
      Master Sensor Socket Kit - 7 Pc by Powerbuilt®. Sven piece Master Sensor Socket Kit removes and installs oxygen sensors, oil pressure sending units and vacuum switches equipped with wires or vacuum tubes. The kit includes single...
      Made with precision and quality in mindDesigned to meet your specific needs
      $35.38
    • Genuine® PCV Valve
      (0 reviews)
      # 8801337
      Subaru WRX STI 2004, PCV Valve by Genuine®. Note: Production: 04/2003. If you have a dirty air filter, clogged PCV valve, or defective MAF sensor you may be tempted to just run down to the local auto parts chain store for a...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $26.21
    • Genuine® Breather Hose
      (0 reviews)
      # 8886383
      Subaru WRX 2004, Breather Hose by Genuine®. Note: Right side Cylinder Head to P.C.V. Pipe. If you have a dirty air filter, clogged PCV valve, or defective MAF sensor you may be tempted to just run down to the local auto parts chain...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $30.74 - $42.39
    • Denso® Upstream OE Connector Air Fuel Ratio Sensor
      (0 reviews)
      # 21104193
      Subaru WRX 2004, Upstream OE Connector Air Fuel Ratio Sensor by Denso®. 4 Wires. The air/fuel ratio sensor sends information to the engine management computer to makes adjustments based on driving conditions. This wider range and...
      Tarnish-proof platinum electrodes provides longer life and maintains accuracyQuick-response planar zircon element can quickly detect oxygen concentration
      $101.48 - $122.81
    • Spectra Premium® Downstream Oxygen Sensor
      (0 reviews)
      # 22807971
      Subaru WRX / WRX STI 2004, Downstream Oxygen Sensor by Spectra Premium®. To ensure your vehicle has optimal performance and fuel economy while producing minimal emissions replace a defective O2 sensor with one backed by the...
      Increase vehicle fuel economy and engine performance while decreasing vehicle exhaust emissions100% performance tested to meet vehicle requirements
      $63.49
    • FRAM® PCV Valve
      (0 reviews)
      # 40170785
      Subaru WRX FI 2004, PCV Valve by FRAM®. The Positive Crankcase Ventilation (PCV) system prevents the release of harmful emissions, helps keep engine oil clean and prevents excessive crankcase pressure, which can cause oil leaks....
      Essential component of the PCV systemRegulates flow of crankcase vapors into the engine
      $5.44
    • Accel® UEGO Wideband O2 Module
      (0 reviews)
      # 12710251
      Universal UEGO Wideband O2 Module by Accel®. No matter what vehicle you own, its ignition system is what helps to achieve the mileage and power you bought it for. Quality ignition system components are a sure way to let your engine...
      The finest quality at a great priceImproves your engine's performance
      $584.85
    • Powerbuilt® 1/2" Dr. 7/8" (22mm) Oxygen Sensor Socket
      (0 reviews)
      # 16795808
      1/2" Dr. 7/8" (22mm) Oxygen Sensor Socket by Powerbuilt®. For removing and installing oxygen sensor and vacuum switches. Specially designed 7/8" (22mm) socket features slot for wiring connector pigtail or vacuum nipples. 2-1/2"...
      Made with precision and quality in mindDesigned to meet your specific needs
      $6.43
    • Powerbuilt® Specialty Switch Socket Kit
      (0 reviews)
      # 16795844
      Specialty Switch Socket Kit - Kit #62 by Powerbuilt®. For removal and installation of hard to reach oxygen sensors, oil pressure switches, oil pressure sending units and thermal sensor switches.
      Made with precision and quality in mindDesigned to meet your specific needs
      $44.18

    Guides & Articles
    An oxygen sensor (also known as an O2 sensor or Lambda sensor) is a sensor designed to generate a reading based on the content of oxygen in an automotive exhaust system. The sensor itself is made of a ceramic compound with porous-shaped electrodes coated in platinum, surrounded by a protective metal shell casing. O2 sensor casings are threaded, and the entire unit...
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    2004 Subaru WRX Emission Control Reviews
    Average rating: 5 5 - 1 reviews
    (5)
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    Carbon Canester
    2003 Subaru WRX | Posted by Jacob | (Wheeling, WV)

    Works great, easy installations.

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