Walker 350-34263 Oxygen Sensor - Downstream or Downstream Front

Walker 350-34263 Oxygen Sensor Overview

Walker Products 350-34263 is a heated oxygen sensor built as a specific-fit OE replacement for select Nissan and INFINITI applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions system operation.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for exact application fitment, including the correct mounting position and connector style for the vehicle.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for direct application matching
• 4-wire configuration with female connector
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 19.61 in.
• Overall length: 23.15 in.
• Radiused polygon connector shape for application-specific connection
• Walker Products part number 350-34263

Detailed Description

This Walker oxygen sensor is designed for downstream and downstream front positions on select 1996-1999 Nissan Maxima, 1997-1998 INFINITI I30, 1999 INFINITI G20, 1998 Nissan 200SX, and 1999 Nissan Maxima applications. It is built to provide the ECU with the correct sensor feedback for emissions monitoring and fuel management, making it a practical replacement when the original sensor has aged or failed. The Walker Products 350-34263 is a direct-fit option for drivers servicing a Nissan Maxima oxygen sensor or an INFINITI I30 downstream front oxygen sensor.

Walker Products Aftermarket has long focused on engine management components, and this sensor reflects that OE-style application matching. If the original sensor has triggered a fault code, caused poor running, or increased exhaust emissions, replacing the affected sensor can restore proper system input. This part cross-references Walker Products 350-34263 for the same application.

What It Can Help Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel feedback to the ECU
• Reduced fuel economy from a failing downstream sensor
• Elevated exhaust emissions
• Rough engine operation tied to sensor fault codes

Installation Notes and Tips

• Confirm the vehicle position before ordering; this part is used in downstream and downstream front locations only.
• Inspect the sensor wiring harness and connector for heat damage, corrosion, or abrasion before installation.
• Verify thread size and connector shape match the original sensor on the vehicle.
• Clear stored fault codes after installation and confirm the repair with a scan tool.
• For 1998-1999 Nissan Maxima applications, check the build date and emissions configuration noted in the fitment data.

Quality Assurance

Walker Products manufactures engine management sensors as OE replacement parts for worldwide vehicle applications and operates under Automotive ISO 9001 / TS 16949 quality systems. The brand has supplied fuel system and sensor components since 1946, with application-specific engineering for fitment and ECU feedback requirements.

Compatible With 1996-1999 Nissan Maxima, downstream rear and downstream front; 1997-1998 INFINITI I30, downstream front; 1999 INFINITI G20, downstream; 1998 Nissan 200SX, downstream; 1999 Nissan Maxima, downstream front.