2003 Subaru WRX Emission Control

    • Bosch®Premium Oxygen Sensor
      $74.83from $59.86
      (0)
      Subaru WRX 2003, 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
      # 35994368
    • Bosch®Wideband Oxygen Sensor
      $172.69from $138.15
      (0)
      Subaru WRX 2003, 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
      # 35994375
    • Beck Arnley®PCV Valve
      $15.84$12.67
      (0)
      Subaru WRX 2003, PCV Valve by Beck Arnley®. For one hundred years, Beck/Arnley has been providing premium OE quality parts for vehicles. Beginning with motorcycle parts in 1914 and transitioning to import vehicles in the 1950’s,...
      OE quality products from top original equipmentTop quality materials
      # 36226008
    • Delphi®Rear OE Downstream Oxygen Sensor
      $63.51$50.81
      (0)
      Subaru WRX 2003, Rear OE Downstream Oxygen Sensor by Delphi®, 7/8" Wrench, Square-4 Blade Connector, 18 x 1.5mm Thread, 4 Wires, 700mm Overall Length, 7/8" Wrench, 150,000 miles Inspection Interval. Heated. As one of the leading...
      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
      # 24558282
    • Accel®Gen VII™Linear Oxygen Sensor
      $93.53from $74.82
      (0)
      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
      # 12710299
    • NTK®Replacement Oxygen Sensor
      $86.31$69.05
      (0)
      Subaru WRX 2003, 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
      # 22131767
    • Denso®Downstream OE Connector Oxygen Sensor
      $59.05$47.24
      (0)
      Subaru WRX 2003, Downstream OE Connector Oxygen Sensor by Denso®, 1 Piece. Denso's light duty oxygen sensor started to appear on vehicles with the development of fuel injection systems. The basic job of the sensor is to monitor the...
      Corrosion-resistant stainless steel constructionPTFE filter blocks efficiency-robbing contaminants
      # 21071909
    • Bosch®Universal Fit Oxygen Sensor
      $47.03from $37.62
      (0)
      Subaru WRX 2003, 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. That's why...
      Up to 15 % savings in fuel costsReduced CO2 emissions
      # 35994372
    • FRAM®PCV Valve
      $6.28$5.02
      (0)
      Subaru WRX FI 2003, 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
      # 40170785
    • Accel®UEGO Wideband O2 Module
      $619.50$495.60
      (0)
      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
      # 12710251
    • Walker Products Inc.®OE Connector Oxygen Sensor
      $113.61$90.89
      (0)
      Subaru WRX 2.0L 2003, 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...
      # 8738825
    • Genuine®Carbon Canister
      $152.76$122.21
      (0)
      Subaru WRX 2003, 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 and gas...
      # 8798132
    • Genuine®Purge Valve
      $59.39$47.51
      (0)
      Subaru WRX 2003, 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 repair, but...
      # 8804936
    • Denso®Upstream OE Connector Air Fuel Ratio Sensor
      $159.94$127.95
      (0)
      Subaru WRX 2003, Upstream OE Connector Air Fuel Ratio Sensor by Denso®, 1 Piece. 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
      # 21104185
    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...