Walker 350-34433 Oxygen Sensor - Downstream Left or Downstream Right

Walker 350-34433 Oxygen Sensor for BMW

Walker Products 350-34433 is a heated oxygen sensor built as an OE-style replacement for specific BMW applications. It is engineered for the correct fitment position and ECU feedback, making it a direct choice for downstream sensor replacement on select BMW M5, M6, 545i, 645Ci, 745i, 745Li, 760i, 760Li, and X5 models.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for the correct BMW application and position
• 4-wire configuration with female connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 15.28 in.; overall length: 18.82 in.
• Radiused polygon connector shape for application-specific connection
• Walker Products Aftermarket part number 350-34433

Walker Products Engine Management Line

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed as OE replacement parts for a wide range of vehicles. The 350-34433 oxygen sensor follows that approach with application-specific fitment, so the sensor location, connector style, and electrical feedback match the vehicle’s requirements. For BMW owners searching for a downstream oxygen sensor replacement, this part number is built around the exact vehicle position rather than a universal layout.

Detailed Description

Walker 350-34433 is a heated oxygen sensor for downstream right and downstream left positions on select BMW models. It is designed to provide the ECU with the proper diagnostic feedback after exhaust gases pass through the catalytic converter. This makes it a practical replacement when the original sensor is triggering fault codes, affecting fuel control, or contributing to a malfunction indicator light. The part number 350-34433 is listed for BMW M5, BMW M6, BMW 545i, BMW 645Ci, BMW 745i, BMW 745Li, BMW 760i, BMW 760Li, and BMW X5 applications across the model years shown below.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light related to a downstream oxygen sensor fault
• Poor engine performance caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel monitoring
• Higher exhaust emissions from a failing sensor
• Damaged sensor wiring or connector issues at the exhaust location

Installation Notes and Fitment

• Fits 2011 BMW M6, downstream right.
• Fits 2006-2010 BMW M5, downstream right.
• Fits 2006-2010 BMW M5, downstream left.
• Fits 2006-2010 BMW M6, downstream right.
• Fits 2006-2010 BMW M6, downstream left.
• Fits 2004-2006 BMW 545i, downstream right.
• Fits 2004-2006 BMW 545i, downstream left.
• Fits 2004-2006 BMW 760i, downstream right.
• Fits 2004-2006 BMW 760i, downstream left.
• Fits 2003-2006 BMW 760Li, downstream right.
• Fits 2003-2006 BMW 760Li, downstream left.
• Fits 2004-2006 BMW X5, downstream right.
• Fits 2004-2005 BMW 645Ci, downstream right.
• Fits 2004-2005 BMW 645Ci, downstream left.
• Fits 2004-2005 BMW 745i, downstream right.
• Fits 2004-2005 BMW 745i, downstream left.
• Fits 2004-2005 BMW 745Li, downstream right.
• Fits 2004-2005 BMW 745Li, downstream left.
• Fits 2002 BMW 745i, downstream right.
• Fits 2002 BMW 745i, downstream left.
• Fits 2002 BMW 745Li, downstream right.
• Fits 2002 BMW 745Li, downstream left.
• Fits 2003 BMW 745i, downstream right, with to 9/02 and from 9/02 build notes listed in catalog data.
• Fits 2003 BMW 745i, downstream left, with to 9/02 and from 9/02 build notes listed in catalog data.
• Fits 2003 BMW 745Li, downstream right, with to 9/02 and from 9/02 build notes listed in catalog data.
• Fits 2003 BMW 745Li, downstream left, with to 9/02 and from 9/02 build notes listed in catalog data.

Before installation, verify the downstream left or downstream right position, connector style, and harness routing against the original sensor. Inspect the sensor wiring harness and connector for heat damage or abrasion, since exhaust-area wear can shorten sensor life.

Quality Assurance

Walker Products has supplied engine management and oxygen sensor components since 1946 and manufactures this part as an OE replacement for the specified BMW applications. The brand’s ISO 9001/TS 16949 certified manufacturing background supports consistent application-specific fitment and diagnostic performance.