Walker 350-33063 Oxygen Sensor

Walker Oxygen Sensor for OE-Style Engine Feedback

Walker Products 350-33063 is a heated oxygen sensor built as a specific-fit replacement for select Nissan, INFINITI, and Mercury applications. It is engineered to deliver the ECU feedback needed for accurate fuel control, emissions monitoring, and fault-code diagnosis.

For drivers searching for a 1991-2003 Nissan Frontier oxygen sensor, a 1996-2001 Nissan Sentra upstream oxygen sensor, or a 1997-2000 INFINITI QX4 upstream right sensor, this part number provides application-specific fitment and connector design.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed vehicle applications
• 3-wire configuration with 20-gauge wiring
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for proper harness connection
• Wiring harness length: 15.28
• Overall length: 18.82

Product Details

Walker Products Aftermarket 350-33063 is part of the Walker Products Engine Management line, which focuses on OE-style replacement sensors for engine management and emissions systems. This oxygen sensor is built for the specified fitment position so the ECU receives the correct signal for air-fuel control and diagnostic monitoring. It is a direct replacement choice for vehicles that need an upstream sensor, including many Nissan Frontier, Nissan Xterra, Nissan Sentra, and INFINITI QX4 applications.

When an oxygen sensor begins to fail, the vehicle may run rich or lean, fuel economy can drop, emissions can increase, and the malfunction indicator light can illuminate. On newer vehicles, the ECU may also store fault codes tied to the sensor circuit or related systems. Part number 350-33063 is intended to restore the signal quality needed for proper engine management on the listed applications.

This part cross-references Walker Products Aftermarket 350-33063 for the same application.

Common Problems This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy from incorrect air-fuel feedback
• Rough running caused by inaccurate upstream sensor readings
• Increased exhaust emissions from faulty sensor input
• Stored ECU fault codes tied to the sensor circuit

Installation Notes and Tips

• Confirm the exact position before ordering; this sensor is listed for upstream, upstream right, upstream left, and upstream front applications depending on vehicle.
• Verify emissions configuration carefully on Nissan Frontier, Nissan Xterra, Nissan Sentra, and Nissan 200SX applications, since some listings differ by California, California-ESV, Federal, or build-date requirements.
• Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation.
• Check the exhaust bung threads and sensor seating surface before threading in the new sensor.
• Clear diagnostic trouble codes after installation and verify closed-loop operation.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and manufactures to Automotive ISO9001/TS 16949 standards. The 350-33063 is produced as a specific application replacement to support the diagnostic feedback expected by the ECU.