Walker 350-34275 Oxygen Sensor - Downstream Right or Upstream

Walker 350-34275 Oxygen Sensor Overview

Walker Products 350-34275 is a heated oxygen sensor built as a specific-fit replacement for select Nissan applications. It is engineered to provide the ECU with the feedback needed for fuel control and emissions monitoring, making it a direct service part for downstream and upstream sensor locations on listed vehicles.

Compatible With 2003 Nissan Pathfinder downstream right and 2003 Nissan X-Trail upstream applications, this Walker Products Aftermarket sensor is a practical choice when diagnosing a check engine light, poor fuel economy, or elevated exhaust emissions. The 350-34275 is also listed for 2003 Nissan X-Trail front oxygen sensor service.

Key Features

• Heated oxygen sensor for emissions and engine management feedback
• Specific-fit design for the listed Nissan Pathfinder and Nissan X-Trail applications
• Threaded mounting type with 18.0 mm thread diameter
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector for application-specific connection
• Wiring harness length: 32.99 in; overall length: 36.54 in

Detailed Description

Walker Products Aftermarket focuses on OE-style engine management and oxygen/air-fuel sensors for vehicle-specific service needs. Part number 350-34275 is manufactured for the correct application and sensor position so the ECU receives the expected diagnostic signal. For 2003 Nissan Pathfinder and 2003 Nissan X-Trail service, this oxygen sensor supports downstream right and upstream locations as listed in the fitment data.

Walker Products has supplied engine management and fuel system components since 1946 and operates with ISO 9001/TS 16949 certification. The brand line is centered on aftermarket replacement sensors built for modern diagnostic systems, where accurate sensor feedback is important for drivability and emissions control. This part cross-references no additional part numbers in the provided data.

What It Helps Address

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

Installation Notes and Tips

Verify the sensor position before installation: 2003 Nissan Pathfinder downstream right, or 2003 Nissan X-Trail upstream. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacement, since physical damage can shorten service life and affect signal quality. Confirm thread size and connector style match the original unit before installation.

Quality Assurance

Walker Products manufactures this sensor as an OE replacement for the specified application and position. The part is backed by the company’s ISO 9001/TS 16949 manufacturing standards and long-running focus on engine management sensors.