Walker 350-33044 Oxygen Sensor - Upstream Left

Walker 350-33044 Oxygen Sensor for Pathfinder and QX4

Walker Products 350-33044 is a heated oxygen sensor built as a specific-fit OE replacement for select Nissan Pathfinder and INFINITI QX4 applications. It is engineered to provide the ECU with the correct exhaust feedback for upstream left sensor locations on covered vehicles.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the upstream left position
• 3-wire configuration with 20-gauge wiring
• Threaded mount with 18.0 mm thread diameter
• Radiused polygon male connector for application-specific fitment
• Wiring harness length: 35.94 in.; overall length: 39.49 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for direct replacement use. Part number 350-33044 is intended for vehicles that require an upstream left oxygen sensor, including 2001-2003 INFINITI QX4 and 2001-2002 Nissan Pathfinder applications listed below. For search relevance, this oxygen sensor is a direct-fit option for 2001 Nissan Pathfinder upstream left, 2002 Nissan Pathfinder upstream left, and 2001-2003 INFINITI QX4 upstream left service needs.

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

What It Helps Address

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

Installation Notes and Tips

Confirm the upstream left position before ordering. Inspect the sensor wiring harness and connector for damage during diagnosis, since physical wear can shorten sensor life. Verify thread size, connector shape, and harness length against the original part before installation on your Nissan Pathfinder or INFINITI QX4.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacement parts and manufactured under Automotive ISO9001/TS 16949 quality systems. Since 1946, the brand has supplied engine management and fuel system components for vehicle service applications.