Walker 350-34689 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Walker 350-34689 Oxygen Sensor

Walker Products 350-34689 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 correct exhaust feedback for downstream monitoring on vehicles such as the Nissan Versa, Nissan Note, INFINITI Q50, INFINITI Q70, and INFINITI M35h.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for the listed vehicle applications
• 4-wire configuration with female radiused polygon connector
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 12.32 in.; overall length: 15.87 in.
• Walker Products Aftermarket line for engine management and oxygen sensor replacement

Product Details

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors developed as OE-style replacements for a wide range of vehicles. Part number 350-34689 is built for the specified downstream position and is intended to deliver the diagnostic feedback the ECU expects from the affected exhaust circuit. For Nissan Versa and Nissan Note models, as well as INFINITI Q50, Q70, and M35h applications, correct sensor response is important for maintaining proper fuel control and emissions system operation.

This part cross-references no listed interchange numbers in the provided data. Walker 350-34689 is a direct-fit oxygen sensor for downstream bank 1 sensor 2 applications where specified by the vehicle listing.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Poor engine performance caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate sensor readings
• Higher exhaust emissions from a failing heated O2 sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes

Verify the exact position before installation, since this sensor is listed for downstream right, downstream left, and downstream applications depending on the vehicle. Confirm connector style, thread size, and harness routing against the original sensor on the Nissan Versa, Nissan Note, INFINITI Q50, INFINITI Q70, or INFINITI M35h. Inspect the sensor wiring harness and connector for physical damage before replacement, as damaged wiring can shorten sensor life and affect ECU feedback.

Quality Assurance

Walker Products states that its engine management sensors are manufactured for specific applications and fitment positions, with production supported by ISO 9001/TS 16949 quality systems. Since 1946, Walker Products has supplied oxygen and fuel system components for automotive replacement use.