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2004 Subaru Impreza Oxygen Sensor

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Replacement Oxygen Sensor - Downstream

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Our List Price: $31.95
with FREE Shipping
(16) In Stock
Part Number: 18021-02804024
Notes: OE Style -- 4 Wire; Direct Fit; Correct Connector; No cutting or splicing; Correct wire length (21.5 Inches or 540mm)
Product Remark: O2 OXYGEN SENSOR
Position: Downstream
Condition: New

Shipping Options:
Free Ground Shipping
This Product Fits the Following: Catalog: E
Vehicle Engine
2004 Subaru Impreza 2.0L H4 
2004 Subaru Impreza 2.5L H4 Turbocharged 

Denso Oxygen Sensor - Rear
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(2 Reviews)
5 Stars
Denso W0133-1654566
Oxygen Sensor
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Product List Price:
$189.95
Our List Price: $73.48
(17) In Stock
Part Number: W0133-1654566
Notes: OE Connector
Features:
  • SUPERIOR DESIGN - Maximizes engine performance and fuel efficiency while reducing harmful emissions.
  • DOUBLE-PROTECTION COVER - Maintains proper unit temperature for quicker response times and protects the ceramic element against silicone and lead poisoning.
  • ALUMINUM-OXIDE TRAP LAYER - Keeps silicone and lead outside the ceramic element through DENSO's exclusive design, preventing damage to the platinum electrode.
  • STAINLESS STEEL HOUSING - Resists corrosion and contamination with
Position: Rear
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
This Product Fits the Following: Catalog: A
Vehicle Engine Transmission
2004 Subaru Impreza 2.0L H4  Automatic 
2004 Subaru Impreza 2.0L H4  Standard 
2004 Subaru Impreza 2.5L H4 Turbocharged   

Denso Oxygen Sensor - Rear
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(Read reviews)
Product List Price:
$199.95
Our List Price: $103.48
(25) In Stock
Part Number: W0133-1608576
Notes: OE Connector
Features:
  • SUPERIOR DESIGN - Maximizes engine performance and fuel efficiency while reducing harmful emissions.
  • DOUBLE-PROTECTION COVER - Maintains proper unit temperature for quicker response times and protects the ceramic element against silicone and lead poisoning.
  • ALUMINUM-OXIDE TRAP LAYER - Keeps silicone and lead outside the ceramic element through DENSO's exclusive design, preventing damage to the platinum electrode.
  • STAINLESS STEEL HOUSING - Resists corrosion and contamination with
Position: Rear
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
This Product Fits the Following: Catalog: A
Vehicle Engine
2004 Subaru Impreza Naturally Aspirated 

Denso Oxygen Sensor - Downstream
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(6 Reviews)
5 Stars
Denso 234-4732
Oxygen Sensor
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Our List Price: $54.33
(>35) In Stock
Part Number: 18021-05051701
Notes: OE Style -- DENSO is the O.E. Manufacturer / Oxygen Sensor
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.0L H4 
2004 Subaru Impreza 2.5L H4 Turbocharged 

Denso Oxygen Sensor - Downstream
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(1 Reviews)
5 Stars
Denso 234-4706
Oxygen Sensor
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Our List Price: $60.33
(>35) In Stock
Part Number: 18021-05051691
Notes: OE Style -- O.E. Quality Replacement Sensor
Features:
  • Designed to detect the amount of oxygen in the exhaust system
  • Constructed from high quality material
  • Features double protection layer, aluminum oxide trap layer, PTFE filter and stainless steel housing
  • Manufactured with precision to meet OE standards
  • Easy installation
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.5L H4 Naturally Aspirated 

Denso Oxygen Sensor - Downstream
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(2 Reviews)
5 Stars
Denso 234-4700
Oxygen Sensor
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Our List Price: $42.33
(>35) In Stock
Part Number: 18021-05051685
Notes: Universal -- O.E. Quality Universal Replacement Sensor
Features:
  • Manufactured to the highest O.E. quality, guaranteed to fit right
  • Aluminum oxide trap, this extra layer helps to protect from silicone and lead poisoning
  • Stainless steel housing and porous Teflon filter all contribute to make a long life
  • Improved engine performance and greater fuel efficiency
  • Prevents premature sensor failure
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.5L H4 Naturally Aspirated 

Bosch Oxygen Sensor - Downstream
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(3 Reviews)
5 Stars
Bosch 13469
Oxygen Sensor
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Our List Price: $66.98
(6) In Stock
Part Number: 18021-09019894
Notes: Actual OE Oxygen Sensor
Features:
  • Designed to determine the oxygen content of the exhaust gas
  • Improves fuel economy and lowers emission
  • Includes three OE heated wires
  • Advanced ceramic technology for consistent performance and long life
  • Features a Platinum Power-Grid that produces a precise voltage signal for the engine ECU
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: H
Vehicle Engine
2004 Subaru Impreza 2.5L H4 Naturally Aspirated 

Bosch Oxygen Sensor - Downstream
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(1 Reviews)
5 Stars
Bosch 15025
Oxygen Sensor
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Our List Price: $57.98
(8) In Stock
Part Number: 18021-09125860
Notes: Engineered Oxygen Sensor
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: H
Vehicle Engine Transmission
2004 Subaru Impreza 2.0L H4  Standard 
2004 Subaru Impreza 2.5L H4 Turbocharged   

Bosch Oxygen Sensor - Downstream
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Our List Price: $60.33
(6) In Stock
Part Number: 18021-05276136
Notes: Engineered Oxygen Sensor
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine Transmission
2004 Subaru Impreza 2.0L H4  Automatic 

Bosch Oxygen Sensor - Front
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Product List Price:
$201.95
Our List Price: $111.48
(14) In Stock
Part Number: W0133-1653795
Notes: OE Connector
Position: Front
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
This Product Fits the Following: Catalog: A
Vehicle Engine
2004 Subaru Impreza 2.5L H4 Turbocharged 

Bosch Oxygen Sensor - Rear
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Product List Price:
$170.95
Our List Price: $56.48
(11) In Stock
Part Number: W0133-1791087
Notes: OE Connector
Position: Rear
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
This Product Fits the Following: Catalog: A
Vehicle Engine Transmission
2004 Subaru Impreza 2.0L H4  Standard 
2004 Subaru Impreza 2.5L H4 Turbocharged   

Bosch Oxygen Sensor - Rear
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(Read reviews)
Product List Price:
$199.95
Our List Price: $62.48
(12) In Stock
Part Number: W0133-1607316
Notes: OE Connector
Position: Rear
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
This Product Fits the Following: Catalog: A
Vehicle Engine
2004 Subaru Impreza Naturally Aspirated 

Bosch Oxygen Sensor - Front
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(Read reviews)
Product List Price:
$201.95
Our List Price: $111.48
(14) In Stock
Part Number: W0133-1653795
Notes: OE Connector - (Air Fuel Ratio Sensor)
Position: Front
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
This Product Fits the Following: Catalog: A
Vehicle Engine
2004 Subaru Impreza 2.5L H4 Turbocharged 

Bosch Oxygen Sensor - Downstream
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(24 Reviews)
4.8 Stars
Bosch 15730
Oxygen Sensor
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Our List Price: $38.98
(19) In Stock
Part Number: 18021-09020235
Notes: Universal Oxygen Sensor
Features:
  • Revolutionary patented submersible connection system protects against water and contamination and withstands the effects of extreme temperature and engine vibration
  • Special heat-resistant Posi-Lock connectors ensure easy installation
  • User-friendly instructions eliminate the need to call a hotline for assistance
  • Coated threads for easy installation
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: H
Vehicle Engine
2004 Subaru Impreza 2.0L H4 
2004 Subaru Impreza 2.5L H4 Turbocharged 

Bosch Oxygen Sensor - Downstream
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(2 Reviews)
4.5 Stars
Bosch 15732
Oxygen Sensor
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Our List Price: $42.33
(11) In Stock
Part Number: 18021-05020850
Notes: Universal Oxygen Sensor
Features:
  • Revolutionary patented submersible connection system protects against water and contamination and withstands the effects of extreme temperature and engine vibration
  • Special heat-resistant Posi-Lock connectors ensure easy installation
  • User-friendly instructions eliminate the need to call a hotline for assistance
  • Coated threads for easy installation
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.5L H4 Naturally Aspirated 

Bosch Oxygen Sensor - Upstream
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(1 Reviews)
5 Stars
Bosch 15537
Oxygen Sensor
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Our List Price: $171.98
(1) In Stock
Part Number: 18021-09020182
Notes: Validated Oxygen Sensor
Position: Upstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: H
Vehicle Engine
2004 Subaru Impreza 2.0L H4 

Bosch Oxygen Sensor - Upstream
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(3 Reviews)
4.7 Stars
Bosch 15501
Oxygen Sensor
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Our List Price: $132.98
(5) In Stock
Part Number: 18021-09020170
Notes: Validated Oxygen Sensor
Position: Upstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: H
Vehicle Engine
2004 Subaru Impreza 2.5L H4 Naturally Aspirated 

Bosch Oxygen Sensor - Upstream
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(Read reviews)
Our List Price: $122.98
(1) In Stock
Part Number: 18021-09020041
Notes: Validated Oxygen Sensor
Position: Upstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: H
Vehicle Engine
2004 Subaru Impreza 2.5L H4 Turbocharged 

Walker Products Oxygen Sensor - Rear
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(Read reviews)
Product List Price:
$189.95
Our List Price: $68.48
(17) In Stock
Part Number: W0133-1894076
Notes: OE Connector
Position: Rear
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
This Product Fits the Following: Catalog: A
Vehicle Engine Transmission
2004 Subaru Impreza 2.0L H4  Automatic 
2004 Subaru Impreza 2.0L H4  Standard 
2004 Subaru Impreza 2.5L H4 Turbocharged   

Walker Products Oxygen Sensor - Rear
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(Read reviews)
Product List Price:
$199.95
Our List Price: $72.48
(2) In Stock
Part Number: W0133-1917361
Notes: OE Connector
Features:
  • Improved Engine Response & Performance
  • Lower Emissions
  • Improved Fuel Economy
  • Longer Sensor Life
  • Meets OEM Specifications
Position: Rear
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
This Product Fits the Following: Catalog: A
Vehicle Engine
2004 Subaru Impreza Naturally Aspirated 

Delphi Oxygen Sensor - Front
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Our List Price: $171.33
(17) In Stock
Part Number: 18021-05167858
Notes: Oxygen Sensor -- Wrench Size: 7/8 in; Air Fuel Ratio Sensor; Delphi is an OEM supplier
Position: Front
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.5L H4 EJ257 

Delphi Oxygen Sensor - Front
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(1 Reviews)
5 Stars
Delphi ES10936
Oxygen Sensor
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Our List Price: $161.33
(28) In Stock
Part Number: 18021-05167852
Notes: Oxygen Sensor -- Wrench Size: 7/8 in; Delphi is an OEM supplier
Position: Front
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Sub Model Engine
2004 Subaru Impreza Outback  2.5L H4 EJ251 Naturally Aspirated 
2004 Subaru Impreza RS  2.5L H4 EJ251 Naturally Aspirated 
2004 Subaru Impreza TS  2.5L H4 EJ251 Naturally Aspirated 

Delphi Oxygen Sensor - Rear
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(Read reviews)
Our List Price: $52.33
(11) In Stock
Part Number: 18021-05168095
Notes: Oxygen Sensor -- Wrench Size: 7/8 in; Delphi is an OEM supplier
Position: Rear
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.0L H4 
2004 Subaru Impreza 2.5L H4 EJ257 

Delphi Oxygen Sensor - Rear
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(Read reviews)
Our List Price: $70.33
(4) In Stock
Part Number: 18021-05167982
Notes: Oxygen Sensor -- Wrench Size: 7/8 in; Delphi is an OEM supplier
Position: Rear
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Sub Model Engine
2004 Subaru Impreza Outback  2.5L H4 EJ251 Naturally Aspirated 
2004 Subaru Impreza RS  2.5L H4 EJ251 Naturally Aspirated 
2004 Subaru Impreza TS  2.5L H4 EJ251 Naturally Aspirated 

Walker Oxygen Sensor - Downstream
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(Read reviews)
Our List Price: $55.33
(>35) In Stock
Part Number: 18021-05239220
Notes: OE -- Downstream
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.0L H4 EJ205 FI Turbocharged GAS 
2004 Subaru Impreza 2.5L H4 EJ257 FI Turbocharged GAS 

Walker Oxygen Sensor - Downstream
Click to Enlarge
(Read reviews)
Our List Price: $69.33
(>35) In Stock
Part Number: 18021-05239139
Notes: OE -- Downstream
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.5L H4 EJ251 FI Naturally Aspirated GAS 

Walker Oxygen Sensor - Upstream
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(Read reviews)
Our List Price: $137.33
(>35) In Stock
Part Number: 18021-05368934
Notes: OE -- Upstream
Position: Upstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.0L H4 EJ205 FI Turbocharged GAS 

Walker Oxygen Sensor - Upstream
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(Read reviews)
Our List Price: $109.33
(>35) In Stock
Part Number: 18021-05368951
Notes: OE -- Upstream
Position: Upstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.5L H4 EJ257 FI Turbocharged GAS 

Walker Oxygen Sensor - Upstream
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(1 Reviews)
5 Stars
Walker 250-54011
Oxygen Sensor
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Our List Price: $139.33
(>35) In Stock
Part Number: 18021-05239391
Notes: OE -- Upstream
Position: Upstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.5L H4 EJ251 FI Naturally Aspirated GAS 

NGK Oxygen Sensor - Downstream
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(Read reviews)
Our List Price: $69.98
(15) In Stock
Part Number: 18021-09082788
Notes: Direct Fit Oxygen Sensor -- B1S2; OE Replacement
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: H
Vehicle Engine
2004 Subaru Impreza 2.0L H4 
2004 Subaru Impreza 2.5L H4 Turbocharged 

NGK Oxygen Sensor - Downstream
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(Read reviews)
Our List Price: $67.98
(3) In Stock
Part Number: 18021-09082746
Notes: Direct Fit Oxygen Sensor -- B1S2; OE Replacement
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: H
Vehicle Engine
2004 Subaru Impreza 2.5L H4 Naturally Aspirated 

ACERA Oxygen Sensor - Rear
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(Read reviews)
Product List Price:
$199.95
Our List Price: $61.48
(2) In Stock
Part Number: W0133-2035248
Notes: OE Connector
Product Remark: Gunmetal/Bronze Housing
Features:
  • Premium OE Connector
  • Premium stainless steel body protecting against extreme heat and corrosion
  • Double layer protection for added durability and long life
  • Monolithic ceramic element allowing faster operating temperature
  • Aluma element surface minimizing thermal variation
  • Aluma protection layer that protects the sensor catalyst from harmful gas
  • Isolated circuitry that reduces signal noise
  • Patented Zirconium Oxide (ZrO2) material
  • 100% inspection and testing of p
Position: Rear
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
This Product Fits the Following: Catalog: A
Vehicle Engine
2004 Subaru Impreza Naturally Aspirated 

ACERA Oxygen Sensor - Rear
Click to Enlarge
(Read reviews)
Product List Price:
$199.95
Our List Price: $61.48
(2) In Stock
Part Number: W0133-1969693
Notes: OE Connector
Position: Rear
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
This Product Fits the Following: Catalog: A
Vehicle Engine
2004 Subaru Impreza Naturally Aspirated 

Spectra Premium Oxygen Sensor - Downstream
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(Read reviews)
Our List Price: $53.33
(>35) In Stock
Part Number: 18021-05487763
Notes: Oxygen Sensor
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.5L H4 Naturally Aspirated 

Spectra Premium Oxygen Sensor - Downstream
Click to Enlarge
(Read reviews)
Our List Price: $47.33
(>35) In Stock
Part Number: 18021-05487887
Notes: Oxygen Sensor
Position: Downstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.0L H4 
2004 Subaru Impreza 2.5L H4 Turbocharged 

Spectra Premium Oxygen Sensor - Upstream
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(Read reviews)
Our List Price: $133.33
(6) In Stock
Part Number: 18021-05487867
Notes: Oxygen Sensor -- With 4 Wires
Position: Upstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.5L H4 Naturally Aspirated 

Spectra Premium Oxygen Sensor - Upstream
Click to Enlarge
(Read reviews)
Our List Price: $332.33
(1) In Stock
Part Number: 18021-05640448
Notes: Oxygen Sensor -- With 4 Wires
Position: Upstream
Condition: New

Shipping Options:
Ground
This Product Fits the Following: Catalog: B
Vehicle Engine
2004 Subaru Impreza 2.0L H4 



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