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Oxygen Sensor
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Oxygen Sensor - Upstream or Upstream Right (Walker Products) for 2000-2009 Audi, BMW, Porsche, & Volkswagen NEW

$ 95 .31
120-DayReturns
LifetimeWarranty
100%Money-Back

Product Notes Read before buying

Position: Upstream or Upstream Right (Passenger Side)
OE Replacement
Walker Products Engine Management and Oxygen/Air-Fuel sensors have been engineered and developed to be an Original Equipment Manufacturers replacement for many vehicles worldwide. Every part number is manufactured for the specific application, fitment position on the vehicle, and will provide the relevant diagnostic system feedback as required by the ECU.Newer vehicles will store fault codes in the ECU, some will relate to the affected sensor and its associated systems. A failed sensor might make itself known by causing the engine to run poorly, increase fuel consumption, exhaust emissions, or illuminating a (MIL) malfunction indicator light. The sensor, wiring harness, and connector should also be checked for physical damage. This will most likely also cause their operational life to be shortened.We are an Automotive ISO9001/TS 16949 certified company, with un-paralleled customer service, marketing, and shipping. Our electronic and paper catalogs are designed for today’s fast paced marketplace, along with our eye catching packaging. Since 1946, Walker Products has been the number one choice for the engine management sensors and fuel system components needed for your vehicle. © 2024 Walker Products Inc. All rights reserved.
Brand: Walker Products
Condition: New
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Specifications & Info


Attribute Value
CA Prop65 Nickel Warning: This Product Can Expose You To Chemicals, Including Nickel And Nickel Alloyed Stainless Steel, Which Are Known To The State Of California To Cause Cancer Or Birth Defects Or Other Reproductive Harm. Www.p65warnings.ca.gov
Connector Gender Male
Connector Shape Oblong
Heated Yes
Mounting Type Threaded
Sensor Type Wide-band
Terminal Gender Male
Terminal Type Spade
Thread Diameter 18.0
Wire Gauge Measurement 20.0
Wire Quantity 5

Vehicle Fitment Guide

This part fits the following vehicles:

Audi 3 models (tapclick to expand)(tapclick to hide)
A3 2001-2004 (tapclick to expand)(tapclick to hide)
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SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Advance Hatchback 2002 - 2004 L4 1.8L Turbo FWD Automatic & Manual
Ambiente Hatchback 2004 L4 2.0L FWD Automatic & Manual
Ambiente Hatchback 2004 L4 2.0L Turbo FWD Automatic & Manual
Ambiente Hatchback 2001 - 2003 L4 1.8L Turbo FWD Automatic & Manual
Ambition Hatchback 2001 L4 1.8L Turbo FWD Automatic & Manual
Attraction Hatchback 2004 L4 2.0L FWD Automatic & Manual
Attraction Hatchback 2004 L4 2.0L Turbo FWD Automatic & Manual
Attraction Hatchback 2001 - 2003 L4 1.8L Turbo FWD Automatic & Manual
Attraction Plus Hatchback 2004 L4 2.0L FWD Automatic & Manual
Attraction Plus Hatchback 2004 L4 2.0L Turbo FWD Automatic & Manual
A8 Quattro 2004-2006 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Sedan 2004 - 2006 V8 4.2L AWD Automatic
L Sedan 2005 - 2006 W12 6.0L AWD Automatic
L Sedan 2004 - 2006 V8 4.2L AWD Automatic
L Plus Sedan 2005 - 2006 V8 4.2L AWD Automatic
Plus Sedan 2004 - 2006 V8 4.2L AWD Automatic
TT Quattro 2004-2006 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Convertible 2004 - 2006 L4 1.8L Turbo AWD Manual & Automatic Dual Clutch
Base Convertible 2004 - 2006 V6 3.2L AWD Manual & Automatic Dual Clutch
Base Coupe 2004 - 2006 L4 1.8L Turbo AWD Manual & Automatic Dual Clutch
Base Coupe 2004 - 2006 V6 3.2L AWD Manual & Automatic Dual Clutch
S Line Convertible 2004 - 2006 L4 1.8L Turbo AWD Manual
S Line Coupe 2004 - 2006 L4 1.8L Turbo AWD Manual
Special Edition Convertible 2006 V6 3.2L AWD Automatic Dual Clutch
Special Edition Coupe 2006 V6 3.2L AWD Automatic Dual Clutch
BMW 4 models (tapclick to expand)(tapclick to hide)
325Ci 2003 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Convertible 2003 L6 2.5L RWD Automatic & Manual
Base Coupe 2003 L6 2.5L RWD Automatic & Manual
325i 2003-2005 (tapclick to expand)(tapclick to hide)
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SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Sedan 2003 - 2005 L6 2.5L RWD Automatic & Manual
Base Wagon 2003 - 2005 L6 2.5L RWD Automatic & Manual
545i 2004-2005 (tapclick to expand)(tapclick to hide)
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SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Sedan 2004 - 2005 V8 4.4L RWD Automatic & Manual
645Ci 2004-2005 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Convertible 2004 - 2005 V8 4.4L RWD Automatic & Manual
Base Coupe 2004 - 2005 V8 4.4L RWD Automatic & Manual
Porsche 1 model (tapclick to expand)(tapclick to hide)
Cayenne 2003-2006 (tapclick to expand)(tapclick to hide)
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SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base SUV 2004 - 2006 V6 3.2L AWD Automatic & Manual
S SUV 2004 - 2006 V8 4.5L AWD Manual
S SUV 2003 - 2006 V8 4.5L AWD Automatic
Turbo SUV 2003 - 2006 V8 4.5L Turbo AWD Automatic
Turbo S SUV 2006 V8 4.5L Turbo AWD Automatic
Volkswagen 8 models (tapclick to expand)(tapclick to hide)
Beetle 2001-2005 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Cabrio Convertible 2003 - 2005 L4 2.0L FWD Automatic & Manual
GL Convertible 2004 L4 1.9L DIESEL Turbo FWD Automatic Dual Clutch
GL Convertible 2004 L4 2.0L FWD Automatic Dual Clutch
GL Convertible 2003 L4 1.8L Turbo FWD Automatic & Manual
GL Convertible 2003 - 2004 L4 1.9L DIESEL Turbo FWD Automatic & Manual
GL Convertible 2003 - 2005 L4 2.0L FWD Automatic & Manual
GL Hatchback 2004 L4 1.9L DIESEL Turbo FWD Automatic Dual Clutch
GL Hatchback 2004 L4 2.0L FWD Automatic Dual Clutch
GL Hatchback 2001 - 2003 L4 1.8L Turbo FWD Automatic & Manual
GL Hatchback 2001 - 2004 L4 1.9L DIESEL Turbo FWD Automatic & Manual
GL Hatchback 2001 - 2005 L4 2.0L FWD Automatic & Manual
GLS Convertible 2004 - 2005 L4 1.8L Turbo FWD Automatic Dual Clutch
GLS Convertible 2004 L4 1.9L DIESEL Turbo FWD Automatic Dual Clutch
GLS Convertible 2004 - 2005 L4 2.0L FWD Automatic Dual Clutch
GLS Convertible 2003 - 2005 L4 1.8L Turbo FWD Automatic & Manual
GLS Convertible 2003 - 2004 L4 1.9L DIESEL Turbo FWD Automatic & Manual
GLS Convertible 2003 - 2005 L4 2.0L FWD Automatic & Manual
GLS Hatchback 2004 - 2005 L4 1.8L Turbo FWD Automatic Dual Clutch
GLS Hatchback 2004 L4 1.9L DIESEL Turbo FWD Automatic Dual Clutch
GLS Hatchback 2004 - 2005 L4 2.0L FWD Automatic Dual Clutch
GLS Hatchback 2001 - 2005 L4 1.8L Turbo FWD Automatic & Manual
GLS Hatchback 2001 - 2004 L4 1.9L DIESEL Turbo FWD Automatic & Manual
GLS Hatchback 2001 - 2005 L4 2.0L FWD Automatic & Manual
GLS Edicion especial Hatchback 2003 L4 2.0L FWD Automatic & Manual
GLS Sport Hatchback 2003 L4 2.0L FWD Automatic & Manual
GLS Sport Turbo Hatchback 2002 - 2005 L4 1.8L Turbo FWD Manual
GLS TDI Hatchback 2005 L4 1.9L DIESEL Turbo FWD Manual & Automatic Dual Clutch
GLS Turbo Hatchback 2001 L4 1.8L Turbo FWD Manual
GLX Convertible 2003 - 2004 L4 1.8L Turbo FWD Automatic & Manual
GLX Hatchback 2001 - 2003 L4 1.8L Turbo FWD Automatic & Manual
GLX Sport Turbo Hatchback 2001 - 2005 L4 1.8L Turbo FWD Manual
GLX Turbo Hatchback 2001 L4 1.8L Turbo FWD Automatic & Manual
Sport Hatchback 2001 - 2002 L4 1.8L Turbo FWD Automatic & Manual
Sport Hatchback 2001 - 2002 L4 1.9L DIESEL Turbo FWD Automatic & Manual
Sport Hatchback 2001 - 2002 L4 2.0L FWD Automatic & Manual
Turbo S Hatchback 2002 - 2005 L4 1.8L Turbo FWD Manual
Bora 2006 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Active Sedan 2006 L5 2.5L FWD Automatic
Exclusive Sedan 2006 L5 2.5L FWD Automatic
GLI Sedan 2006 L4 2.0L Turbo FWD Manual
Prestige Sedan 2006 L5 2.5L FWD Automatic
Style Sedan 2006 L5 2.5L FWD Automatic
Turbo Sedan 2006 L5 2.5L FWD Automatic
Golf 2001-2007 (tapclick to expand)(tapclick to hide)
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SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Hatchback 2001 - 2002 L4 2.0L FWD Manual
Comfortline Hatchback 2003 - 2005 L4 2.0L FWD Manual
Confort Hatchback 2001 - 2002 L4 2.0L FWD Manual
Europa Hatchback 2003 - 2007 L4 2.0L FWD Manual
GL Hatchback 2002 - 2003 L4 1.9L DIESEL Turbo FWD Automatic & Manual
GL Hatchback 2002 - 2006 L4 2.0L FWD Automatic & Manual
GL Hatchback 2001 - 2003 L4 1.9L DIESEL Turbo FWD Automatic & Manual
GL Hatchback 2001 - 2005 L4 2.0L FWD Automatic & Manual
GL TDI Hatchback 2004 L4 1.9L DIESEL Turbo FWD Automatic & Manual
GLS Hatchback 2004 L4 2.0L FWD Automatic & Manual
GLS Hatchback 2001 L4 1.8L Turbo FWD Automatic & Manual
GLS Hatchback 2001 - 2003 L4 1.9L DIESEL Turbo FWD Automatic & Manual
GLS Hatchback 2001 - 2006 L4 2.0L FWD Automatic & Manual
GLS TDI Hatchback 2004, 2006 L4 1.9L DIESEL Turbo FWD Automatic & Manual
GTI Hatchback 2004 - 2005 L4 1.8L Turbo FWD Manual
GTI Hatchback 2001 - 2003 L4 2.0L FWD Manual
GTI 1.8T Hatchback 2002 - 2006 L4 1.8L Turbo FWD Automatic & Manual
GTI 20th Anniversary Hatchback 2003 L4 1.8L Turbo FWD Manual
GTI 337 Hatchback 2002 L4 1.8L Turbo FWD Manual
GTI GLS Hatchback 2001 L4 1.8L Turbo FWD Automatic & Manual
GTI GLX Hatchback 2001 V6 2.8L FWD Manual
GTI Turbo Hatchback 2001 - 2003 L4 1.8L Turbo FWD Manual
GTI VR6 Hatchback 2002 - 2005 V6 2.8L FWD Manual
Lujo Hatchback 2001 - 2002 L4 2.0L FWD Manual
TDI Hatchback 2005 L4 1.9L DIESEL Turbo FWD Automatic & Manual
Trendline Hatchback 2003 - 2005 L4 2.0L FWD Manual
Verano Hatchback 2001 - 2002 L4 2.0L FWD Manual
Jetta 2001-2005 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
2.5 Sedan 2005 L5 2.5L FWD Automatic & Manual
Comfortline Sedan 2004 - 2005 L4 2.0L FWD Manual
Confortline Sedan 2002 - 2003 L4 2.0L FWD Manual
Edicion Limitada Sedan 2003 L4 2.0L FWD Manual
Europa Sedan 2002 - 2005 L4 2.0L FWD Manual
Europa 50 Aniversario Sedan 2004 L4 2.0L FWD Manual
Europa Wolfsburg Sedan 2003 L4 2.0L FWD Manual
GL Sedan 2003 - 2005 L4 1.8L Turbo FWD Automatic & Manual
GL Sedan 2001 - 2005 L4 2.0L FWD Automatic & Manual
GL Wagon 2003 - 2005 L4 1.8L Turbo FWD Automatic & Manual
GL Wagon 2002 - 2005 L4 2.0L FWD Automatic & Manual
GL Confort Sedan 2001 - 2002 L4 2.0L FWD Manual
GL TDI Sedan 2005 L4 1.9L DIESEL Turbo FWD Automatic & Manual
GL TDI Wagon 2005 L4 1.9L DIESEL Turbo FWD Automatic & Manual
GL Variant Wagon 2001 L4 2.0L FWD Manual
GLI Sedan 2005 L4 1.8L Turbo FWD Automatic
GLI Sedan 2004 - 2005 L4 1.8L Turbo FWD Manual
GLI Sedan 2002 - 2004 V6 2.8L FWD Manual
GLI 50 Aniversario Sedan 2004 L4 1.8L Turbo FWD Manual
GLS Sedan 2001 - 2005 L4 1.8L Turbo FWD Automatic & Manual
GLS Sedan 2001 - 2005 L4 2.0L FWD Automatic & Manual
GLS Sedan 2001 - 2002, 2004 V6 2.8L FWD Automatic & Manual
GLS Wagon 2001 - 2005 L4 1.8L Turbo FWD Automatic & Manual
GLS Wagon 2001 - 2005 L4 2.0L FWD Automatic & Manual
GLS Wagon 2001 - 2002, 2004 V6 2.8L FWD Automatic & Manual
GLS TDI Sedan 2005 L4 1.9L DIESEL Turbo FWD Automatic & Manual
GLS TDI Wagon 2005 L4 1.9L DIESEL Turbo FWD Automatic & Manual
GLS Turbo Sedan 2001 L4 1.8L Turbo FWD Manual
GLS Variant Wagon 2001 L4 2.0L FWD Manual
GLS Wolfsburg Sedan 2001 L4 2.0L FWD Manual
GLX Sedan 2001 - 2003 V6 2.8L FWD Automatic
GLX Sedan 2001 - 2002 V6 2.8L FWD Manual
GLX Wagon 2001 - 2002 V6 2.8L FWD Automatic & Manual
GLX VR6 Sedan 2001 - 2002 V6 2.8L FWD Manual
Highline Sedan 2003 L4 2.0L FWD Manual
Highline Sedan 2002 V6 2.8L FWD Manual
Jazz Sedan 2003 L4 2.0L FWD Manual
Limited Edition Sedan 2005 L4 2.0L FWD Manual
Special Edition Sedan 2005 L4 2.0L FWD Manual
Sportline Sedan 2002 - 2005 L4 1.8L Turbo FWD Manual
Summer Edition Sedan 2005 L4 2.0L FWD Manual
TDI Sedan 2005 L4 1.9L DIESEL Turbo FWD Automatic Dual Clutch
TDI Sedan 2001 - 2005 L4 1.9L DIESEL Turbo FWD Manual
TDI Sedan 2001 - 2004 L4 1.9L DIESEL Turbo FWD Automatic
TDI Wagon 2002 - 2004 L4 1.9L DIESEL Turbo FWD Automatic & Manual
Trendline Sedan 2002 - 2005 L4 2.0L FWD Manual
Trendline Wolfsburg Sedan 2003 L4 2.0L FWD Manual
Variant Comfortline Wagon 2002 - 2003 L4 2.0L FWD Manual
Variant Trendline Wagon 2002 - 2003 L4 2.0L FWD Manual
Wolfsburg Edition Sedan 2001, 2003 L4 1.8L Turbo FWD Automatic & Manual
Wolfsburg Edition Wagon 2003 L4 1.8L Turbo FWD Automatic & Manual
Jetta City 2007 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Sedan 2007 L4 2.0L FWD Automatic & Manual
Lupo 2005-2009 (tapclick to expand)(tapclick to hide)
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SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Comfortline Hatchback 2005 - 2009 L4 1.6L FWD Manual
Comfortline Hatchback 2005 - 2009 L4 1.6L FWD Manual
Trendline Hatchback 2005 - 2009 L4 1.6L FWD Manual
Trendline Hatchback 2005 - 2009 L4 1.6L FWD Manual
Passat 2000-2005 (tapclick to expand)(tapclick to hide)
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SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
1.8T Sedan 2000 - 2005 L4 1.8L Turbo FWD Automatic
4 Motion Sedan 2000 V6 2.8L AWD Automatic
4 Motion Wagon 2000 V6 2.8L AWD Automatic
GL Sedan 2003 - 2005 L4 1.8L Turbo FWD Automatic
GL Sedan 2003 - 2004 L4 1.8L Turbo FWD Manual
GL Sedan 2003 - 2004 V6 2.8L FWD Automatic & Manual
GL Wagon 2003 - 2005 L4 1.8L Turbo FWD Automatic
GL Wagon 2003 - 2004 L4 1.8L Turbo FWD Manual
GL Wagon 2003 - 2004 V6 2.8L FWD Automatic & Manual
GL TDI Sedan 2004 - 2005 L4 2.0L DIESEL Turbo FWD Automatic
GL TDI Wagon 2004 - 2005 L4 2.0L DIESEL Turbo FWD Automatic
GLS Sedan 2000 - 2005 L4 1.8L Turbo FWD Automatic & Manual
GLS Sedan 2000 - 2005 V6 2.8L FWD Automatic & Manual
GLS Wagon 2000 - 2005 L4 1.8L Turbo FWD Automatic & Manual
GLS Wagon 2000 - 2005 V6 2.8L FWD Automatic & Manual
GLS 4 Motion Sedan 2004 - 2005 L4 1.8L Turbo AWD Automatic
GLS 4 Motion Sedan 2004 L4 1.8L Turbo AWD Manual
GLS 4 Motion Sedan 2001 - 2002, 2005 V6 2.8L AWD Automatic
GLS 4 Motion Wagon 2004 - 2005 L4 1.8L Turbo AWD Automatic
GLS 4 Motion Wagon 2004 L4 1.8L Turbo AWD Manual
GLS 4 Motion Wagon 2001 - 2002, 2005 V6 2.8L AWD Automatic
GLS TDI Sedan 2004 - 2005 L4 2.0L DIESEL Turbo FWD Automatic
GLS TDI Wagon 2004 - 2005 L4 2.0L DIESEL Turbo FWD Automatic
GLX Sedan 2000 - 2005 V6 2.8L FWD Automatic & Manual
GLX Sedan 2000 V6 2.8L AWD Automatic & Manual
GLX Wagon 2000 - 2005 V6 2.8L FWD Automatic & Manual
GLX Wagon 2000 V6 2.8L AWD Automatic & Manual
GLX 4 Motion Sedan 2003 - 2004 V6 2.8L AWD Manual
GLX 4 Motion Sedan 2001 - 2005 V6 2.8L AWD Automatic
GLX 4 Motion Wagon 2003 - 2004 V6 2.8L AWD Manual
GLX 4 Motion Wagon 2001 - 2005 V6 2.8L AWD Automatic
V6 Sedan 2000 - 2005 V6 2.8L FWD Automatic
V6 4Motion Sedan 2002 - 2005 V6 2.8L AWD Automatic
W8 Sedan 2004 W8 4.0L AWD Manual
W8 Sedan 2002 - 2004 W8 4.0L AWD Automatic
W8 Wagon 2004 W8 4.0L AWD Manual
W8 Wagon 2002 - 2004 W8 4.0L AWD Automatic
Sharan 2002-2005 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Mini Passenger Van 2002 L4 1.8L Turbo FWD Automatic
Comfortline Mini Passenger Van 2003 - 2005 L4 1.8L Turbo FWD Automatic
Verify before ordering — please confirm your vehicle's year, make, model and sub-model specifications before placing your order. If anything is unclear, our customer service team is available to help.

Policies, in plain English.

Shipping Information

We offer fast, reliable shipping on all orders:

  • Ships to all countries via US Postal Service Priority Mail.
  • Most orders ship within 1 business day.
  • Delivery time: 1-4 business days after shipment.
  • International shipping available, including APO/FPO addresses.
  • Tracking information provided for all shipments.
  • Additional handling fees may apply for oversized/overweight packages.

Lifetime Warranty

This part comes with a limited lifetime warranty. Warranty begins on the original purchase date.

Warranty does NOT cover:

  • Shipping costs or labor expenses.
  • Installation errors.
  • Parts used for racing.
  • Commercial vehicle parts.

Returns (120 Days)

We want you to be 100% satisfied with your purchase. That's why we offer:

  • 120-Day Returns - Return any part within 120 days from date of receipt.
  • Must obtain RMA (Return Merchandise Authorization) number before returning.
  • Parts must be in original condition, uninstalled, unaltered, and in original packaging.
  • Important: Electrical parts are not returnable if unsealed.
  • Please inspect parts upon arrival and notify us within 5 days of receiving incorrect or damaged parts.
  • Refunds processed after warehouse receives return and credited to original payment method.
Walker Products Engine Management and Oxygen/Air-Fuel sensors have been engineered and developed to be an Original Equipment Manufacturers replacement for many vehicles worldwide. Every part number is manufactured for the specific application, fitment position on the vehicle, and will provide the relevant diagnostic system feedback as required by the ECU.Newer vehicles will store fault codes in the ECU, some will relate to the affected sensor and its associated systems. A failed sensor might make itself known by causing the engine to run poorly, increase fuel consumption, exhaust emissions, or illuminating a (MIL) malfunction indicator light. The sensor, wiring harness, and connector should also be checked for physical damage. This will most likely also cause their operational life to be shortened.We are an Automotive ISO9001/TS 16949 certified company, with un-paralleled customer service, marketing, and shipping. Our electronic and paper catalogs are designed for today’s fast paced marketplace, along with our eye catching packaging. Since 1946, Walker Products has been the number one choice for the engine management sensors and fuel system components needed for your vehicle. © 2024 Walker Products Inc. All rights reserved.

Fits Years: 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009

Fits Models: 325Ci, 325i, 545i, 645Ci, A3, A8 Quattro, Beetle, Bora, Cayenne, Golf, Jetta, Jetta City, Lupo, Passat, Sharan, TT Quattro

Expert Guides

A Practical Guide to Oxygen Sensors for the 2001-2007 BMW 325i (E46)

Keep your BMW's M54 engine running smoothly by learning how to choose and replace the right oxygen sensors.

 Read Full Guide →

Related Trouble Codes (OBD-II)

4 matching guides

If your scan tool is showing one of these trouble codes, this part is a common fix. Each guide explains the code, how to diagnose it, and exactly what to replace.

↑ A single part can trigger multiple related trouble codes. Each guide is vehicle- and code-specific.
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