Walker 350-33066 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Walker 350-33066 Oxygen Sensor for Nissan and Infiniti

Walker Products 350-33066 is a heated oxygen sensor built as a specific-fit OE replacement for select Nissan and Infiniti applications. It is engineered to deliver the ECU feedback needed for proper fuel control and emissions monitoring on upstream sensor locations.

Compatible With select 1986-2001 Nissan 200SX, 1990-1996 Nissan 300ZX, 1993-1995 Infiniti J30, and 1991-2001 Infiniti Q45 applications in upstream left, upstream right, and upstream positions.

Key Features

• Heated oxygen sensor design for faster operating temperature
• Specific-fit application for the listed vehicle positions
• 3-wire configuration with 20-gauge wiring
• Radiused polygon male connector for vehicle-specific connection
• 18.0 mm thread diameter with threaded mounting type
• Wiring harness length: 21.18; overall length: 24.72

Walker Products Aftermarket Line

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for direct replacement use. The 350-33066 follows that product-line approach by matching the application, mounting position, and ECU feedback requirements for the listed Nissan and Infiniti vehicles.

Detailed Description

The Walker 350-33066 oxygen sensor is designed for upstream use where accurate exhaust feedback is needed to help the engine control module manage air-fuel ratio. This matters on vehicles such as the Nissan 300ZX, Infiniti J30, and Infiniti Q45, where the sensor signal supports fuel delivery and emissions control. As an OE-style replacement, this part is built for the specified fitment and connector layout rather than universal use.

This part number, 350-33066, is intended for vehicles that use a heated, threaded oxygen sensor with the listed connector and harness dimensions. If the original sensor has aged or the wiring has been damaged, replacing it can restore proper ECU input and help maintain normal engine operation.

What It Is Used For

• Check engine light related to upstream oxygen sensor performance
• Poor fuel economy caused by incorrect air-fuel feedback
• Rough running or hesitation from inaccurate exhaust sensing
• Higher exhaust emissions from a failing sensor signal
• Stored ECU fault codes tied to the oxygen sensor circuit

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for upstream left, upstream right, and upstream applications depending on the vehicle. Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals before installation. Confirm thread size, connector shape, and harness length against the original part to ensure proper routing and fit.

For fitment reference, this part installs on select 1986 Nissan 200SX upstream, 1990-1996 Nissan 300ZX upstream left or upstream right, 1993-1995 Infiniti J30 upstream left or upstream right, and 1991-2001 Infiniti Q45 upstream left or upstream right applications.

Quality Assurance

Walker Products has produced engine management and sensor components since 1946 and operates as an ISO 9001/TS 16949 certified company. The 350-33066 is manufactured as a specific application replacement to support the diagnostic feedback expected by the ECU.