Walker 350-34364 Oxygen Sensor - Downstream Left

Walker 350-34364 Oxygen Sensor for OE-Style Emissions Control

Walker Products 350-34364 is a heated oxygen sensor built as a specific-fit replacement for select Nissan Pathfinder and INFINITI QX4 applications. It is engineered to deliver the ECU feedback needed for proper fuel control and emissions monitoring.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for OE-style replacement needs. The 350-34364 follows the application-specific approach used across the line, with the correct fitment position, connector style, and sensor configuration for the listed vehicles.

Key Features

• Heated oxygen sensor for downstream left placement
• Specific-fit design for direct application matching
• 4-wire configuration with 20-gauge wiring
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector
• Wiring harness length: 45.59
• Overall length: 49.13

Detailed Description

This Walker oxygen sensor, part number 350-34364, is designed for 2001 INFINITI QX4 downstream left and 2001 Nissan Pathfinder downstream left applications with the listed production-date notes. As a heated sensor, it helps the vehicle’s ECU monitor exhaust oxygen content after the catalyst so the system can maintain accurate fuel and emissions control.

Use this part when you need a direct replacement oxygen sensor for 2001 INFINITI QX4, downstream left, or 2001 Nissan Pathfinder, downstream left. The specific-fit design helps ensure the connector, harness length, thread size, and sensor position align with the original application requirements.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation tied to incorrect air-fuel correction
• Elevated exhaust emissions from a failing sensor
• Stored ECU fault codes associated with the oxygen sensor circuit

Installation Notes and Tips

Confirm the vehicle build date before ordering, since the listed fitment applies only to the specified production cutoff notes. Inspect the sensor wiring harness and connector for damage before installation, and verify the threaded mounting location matches the downstream left position on the vehicle.

For fitment reference, this part fits 2001 INFINITI QX4, downstream left, and 2001 Nissan Pathfinder, downstream left. This part cross-references Walker Products Aftermarket 350-34364 for the same application.

Quality Assurance

Walker Products has supplied engine management and oxygen sensor components since 1946 and manufactures this part as an OE-style replacement for the listed application. The brand operates with Automotive ISO9001/TS 16949 certification and application-specific engineering practices for sensor fit and ECU feedback.