Walker 350-34355 Oxygen Sensor - Downstream

Walker 350-34355 Oxygen Sensor Overview

Walker Products 350-34355 is a heated oxygen sensor built as a specific-fit OE replacement for select Nissan applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring, especially in downstream positions.

For Nissan Frontier and Nissan Xterra owners, this oxygen sensor supports accurate exhaust monitoring when the original sensor has aged, failed, or triggered a fault code. The Walker Products Aftermarket line focuses on application-specific engine management sensors, and this part number is matched to the required fitment position and connector style.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for the listed Nissan applications
• 4-wire configuration with female connector
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon connector shape for application-specific fitment
• 47.36 in. wiring harness length and 50.91 in. overall length
• Walker Products part number 350-34355

Detailed Description

Walker Products 350-34355 is an emission control sensor designed for downstream use on select Nissan models, including Nissan Frontier and Nissan Xterra applications listed below. As a heated oxygen sensor, it helps the ECU monitor exhaust oxygen content so the engine management system can maintain proper air-fuel control and diagnose sensor-related faults. This part number is built for specific fitment, making it a direct-match replacement for the designated position rather than a universal sensor.

Walker Products Aftermarket engine management sensors are developed as OE-style replacements for a wide range of vehicles. This oxygen sensor is intended for vehicles that require a threaded, 4-wire downstream sensor with the specified connector and harness dimensions. If the original sensor has caused poor running, increased fuel use, elevated emissions, or a malfunction indicator light, replacing it with the correct Walker Products 350-34355 unit can restore proper feedback to the ECU.

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

Vehicle Fitment

• Fits 2009 Nissan Pickup, downstream; fits downstream bank 1 sensor 2 on specific vehicle models.
• Fits 1998-2000 Nissan Frontier, downstream; downstream oxygen sensor for B1S2, not for vehicles in California.
• Fits 1998-2000 Nissan Frontier, downstream; downstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.
• Fits 1998-2000 Nissan Frontier, downstream; downstream oxygen sensor for second bank, sensor 1, non-California emissions.
• Fits 2000 Nissan Xterra, downstream; downstream oxygen sensor for B1S2, not for vehicles in California.
• Fits 2000 Nissan Xterra, downstream; downstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.
• Fits 2000 Nissan Xterra, downstream; downstream oxygen sensor for second bank, sensor 1, non-California emissions.

Installation Notes

Confirm the original sensor position, connector shape, wire count, and thread size before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since damaged wiring can shorten sensor life and affect ECU feedback. Verify emissions calibration requirements for your vehicle, especially on 1998-2000 Nissan Frontier applications with California-specific exclusions.

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. The brand has supplied engine management and fuel system components since 1946, with application-specific cataloging and fitment-focused design.