Walker 350-34442 Oxygen Sensor - Downstream Left

Walker 350-34442 Oxygen Sensor for Downstream Left Fitment

Walker Products 350-34442 is a heated oxygen sensor built for specific downstream left applications on select Nissan Pathfinder and INFINITI QX4 models. It is engineered as an OE-style replacement to deliver the diagnostic feedback the ECU expects from the affected exhaust position.

Key Features

• Heated oxygen sensor for precise exhaust monitoring
• Specific fit design for downstream left placement
• 4-wire configuration with 20-gauge wiring
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon male connector for application-specific connection
• Overall length: 48.94 in.; wiring harness length: 45.39 in.
• Walker Products Aftermarket part number 350-34442

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered for direct replacement use. Part number 350-34442 is built for the downstream left oxygen sensor location and is listed for 2001-2003 INFINITI QX4 and 2001-2002 Nissan Pathfinder applications. For buyers searching for a downstream left oxygen sensor for 2001 Nissan Pathfinder, 2002 Nissan Pathfinder, or 2001-2003 INFINITI QX4, this sensor matches the specified position and connector style required by the vehicle’s ECU feedback strategy.

Walker Products has supplied engine management components since 1946 and manufactures application-specific sensors for defined vehicle fitment. This part cross-references no listed alternate part numbers in the provided data.

What This Sensor Helps Address

• Check engine light related to downstream oxygen sensor faults
• Poor fuel economy caused by inaccurate exhaust feedback
• Elevated exhaust emissions from a failing sensor
• Rough engine operation tied to sensor signal issues
• Stored ECU fault codes for the affected sensor circuit

Installation Notes

Verify the downstream left location before ordering and compare the connector, thread diameter, and harness length to the original sensor. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation. Confirm the exhaust bung and mounting threads are clean and undamaged so the threaded sensor seats correctly.

Quality Assurance

Walker Products manufactures engine management sensors under Automotive ISO9001/TS 16949 certification and builds each part number for a specific application and fitment position. The 350-34442 oxygen sensor is produced to provide the diagnostic system feedback required by the ECU for the listed vehicles.