Walker 350-34691 Oxygen Sensor

Walker 350-34691 Oxygen Sensor Overview

Walker Products 350-34691 is a heated oxygen sensor built as a specific-fit OE replacement for select Ford, Mazda, and Mercury applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper air-fuel control and emissions performance.

For drivers searching for a Ford F-150 oxygen sensor, Ford Ranger upstream O2 sensor, or Explorer Bank 1 Sensor 1 replacement, this Walker Products Aftermarket part number 350-34691 is built around the application details that matter: position, connector style, thread size, and harness length.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for direct application matching
• 4-wire configuration with 22-gauge wiring
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector
• Wiring harness length: 13.31
• Overall length: 16.85
• Walker Products Aftermarket part number 350-34691

Product Details

Walker Products Engine Management and Oxygen/Air-Fuel sensors are developed as OE-style replacements for a wide range of vehicles. This sensor is manufactured for the specified fitment position so the ECU receives the correct feedback for fuel control and emissions monitoring. Walker Products has supplied engine management components since 1946 and operates with ISO9001/TS 16949 certification standards.

This part cross-references common OE-style oxygen sensor applications used in Ford, Mazda, and Mercury platforms. It is a practical choice for owners needing a replacement upstream oxygen sensor on vehicles such as the Ford F-150, Ford Ranger, and Ford Explorer. Part number 350-34691 is also referenced in applications for the Ford Expedition, Lincoln Navigator, and Mazda B3000/B4000 family.

What This Oxygen Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine running caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust readings
• Higher exhaust emissions from a failing upstream sensor
• Fault codes stored in the ECU for sensor-related issues

Installation Notes and Fitment

Fits 2012 Ford E-350 Super Duty, upstream right.

Fits 2001-2011 Ford Ranger, upstream.

Fits 2004-2010 Ford Explorer, upstream left and upstream right.

Fits 2007-2010 Ford Explorer Sport Trac, upstream left and upstream right.

Fits 2002-2010 Mercury Mountaineer, upstream left and upstream right.

Fits 2002-2009 Ford F-250, upstream left and upstream right.

Fits 2005-2009 Ford F-350, N/A.

Fits 2005-2008 Ford F-150, upstream left and upstream right.

Fits 2006-2008 Lincoln Mark LT, upstream left and upstream right.

Fits 2004-2007 Ford Freestar, upstream front and upstream rear.

Fits 2005-2007 Lincoln Navigator, upstream left and upstream right.

Fits 2005-2006 Ford Expedition, upstream left and upstream right.

Fits 2004-2005 Ford Ranger, upstream left and upstream right.

Fits 2004 Ford F-150 Heritage, upstream left and upstream right.

Fits 2002-2003 Ford Ranger, upstream left and upstream right.

Fits 1999-2003 Ford Windstar, upstream front and upstream rear.

Before installation, verify connector shape, harness routing, thread diameter, and sensor position against the original part. Inspect the sensor wiring harness and connector for physical damage, since damaged wiring can shorten service life and affect ECU feedback.

Quality Assurance

Walker Products manufactures engine management sensors as OE replacement components for specific vehicle applications and backs production with ISO9001/TS 16949 quality systems.