Walker 350-34646 Oxygen Sensor

Walker 350-34646 Oxygen Sensor for Nissan and Infiniti

Walker Products 350-34646 is a specific-fit heated oxygen sensor engineered as an OE-style replacement for select Nissan and INFINITI applications. It is built to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions performance.

Key Features

• Heated oxygen sensor with specific-fit application matching
• 4-wire design with 20-gauge wiring
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon connector shape with male connector gender
• Wiring harness length: 12.13; overall length: 15.67
• Walker Products Aftermarket line for engine management and oxygen/air-fuel sensor replacement

Product Details

Walker Products Aftermarket focuses on engine management sensors built for direct replacement use, and part number 350-34646 follows that approach with application-specific fitment and connector configuration. This oxygen sensor is listed across multiple Nissan X-Trail, Sentra, Altima, and Murano positions, along with select INFINITI FX45, Q45, and M45 upstream right applications. For shoppers searching for a Nissan X-Trail upstream oxygen sensor, Nissan Sentra Bank 1 Sensor 1 replacement, or an INFINITI FX45 upstream right oxygen sensor, this part number provides a targeted match for the listed vehicles.

As an oxygen sensor, it supports the ECU’s ability to monitor exhaust content and adjust engine operation. When the original sensor begins to fail, common symptoms can include poor running, higher fuel consumption, increased exhaust emissions, or a malfunction indicator light. Part number 350-34646 is designed for the specified mounting position and vehicle configuration, making it a practical replacement for emissions-related service on the listed models.

What It Can Help Address

• Check engine light related to oxygen sensor performance
• Rough engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust readings
• Elevated exhaust emissions on the affected vehicle
• Fault codes stored in the ECU for the listed sensor position

Installation Notes and Tips

Confirm the exact year, make, model, and sensor position before ordering. This part is listed for upstream, downstream, upstream right, upstream rear, and upstream front positions depending on the vehicle application, so matching the original sensor location is important. Inspect the sensor wiring harness and connector for damage during diagnosis, since physical wear can shorten sensor life and affect operation. For best results, verify the thread size, connector style, and harness length against the original part before installation.

Quality Assurance

Walker Products states that its engine management and oxygen/air-fuel sensors are developed as OE replacement parts and manufactured under Automotive ISO9001/TS 16949 quality systems. Since 1946, Walker Products has supplied engine management sensors and fuel system components for a wide range of vehicle applications.

This part cross-references no listed alternate part numbers in the provided data.

Fits 2004-2007 Nissan X-Trail, upstream; fits 2004-2007 Nissan X-Trail, downstream; fits 2008-2011 Nissan X-Trail, upstream; fits 2012-2017 Nissan X-Trail, upstream and downstream; fits 2002-2004 Nissan Sentra, upstream; fits 2002-2003 Nissan Altima, upstream; fits 2003 Nissan Murano, upstream front and upstream rear; fits 2002-2005 INFINITI Q45, upstream right; fits 2003-2005 INFINITI FX45, upstream right; fits 2003-2004 INFINITI M45, upstream right.