Walker 350-34424 Oxygen Sensor - Downstream, Downstream Rear or Upstream

Walker 350-34424 Oxygen Sensor Overview

Walker Products 350-34424 is a heated oxygen sensor built as a specific-fit OE replacement for select Nissan and INFINITI applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring, especially in downstream positions.

Compatible With 2001-2008 Nissan Altima, 2007-2008 Nissan Pickup, and 2001-2002 INFINITI G20 applications listed below, this Walker Products Aftermarket sensor is designed around the original mounting position and connector style for accurate replacement service.

Key Features

• Heated oxygen sensor for downstream emissions monitoring
• Specific-fit design for the listed Nissan Altima, Nissan Pickup, and INFINITI G20 applications
• 4-wire configuration with a radiused polygon male connector
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 11.93 in.
• Overall length: 15.47 in.
• Wire gauge: 20

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed as OE-style replacements for worldwide vehicle coverage. Part number 350-34424 is built for the specified application and position so the ECU receives the correct diagnostic feedback from the downstream sensor location. For vehicles such as the Nissan Altima and INFINITI G20, correct sensor placement is important because the rear or downstream sensor is used to monitor catalyst performance and emissions-related system operation.

This part cross-references Bosch (e.g., 15733) for the same application.

What This Sensor Helps Address

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

Installation Notes

• Verify the vehicle’s exact build date and sensor position before ordering, especially on 2001-2004 Nissan Altima applications with rear downstream placement notes.
• Install only in the listed downstream or downstream rear position; incorrect placement can affect ECU feedback.
• Inspect the sensor wiring harness and connector for damage before installation.
• Confirm thread size and connector style match the original sensor before replacement.
• Use the vehicle’s service information for proper removal and torque procedures.

Quality Assurance

Walker Products manufactures engine management sensors as OE-replacement components and operates under Automotive ISO9001/TS 16949 certification. Since 1946, the brand has supplied oxygen sensors and fuel system components for vehicle service applications.

Fitment

• Fits 2007-2008 Nissan Pickup, downstream.
• Fits 2004 Nissan Altima, downstream rear.
• Fits 2002-2003 Nissan Altima, downstream rear.
• Fits 2002 INFINITI G20, downstream.
• Fits 2001 INFINITI G20, downstream.
• Fits 2001 Nissan Altima, downstream.