Walker 350-34233 Oxygen Sensor - Downstream Rear

Walker 350-34233 Oxygen Sensor for Nissan and INFINITI

Walker Products 350-34233 is a heated, specific-fit oxygen sensor engineered as an OE-style replacement for select Nissan and INFINITI applications. It is built for the downstream rear position and is designed to deliver the ECU feedback needed for proper fuel control and emissions monitoring.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit for the correct downstream rear location
• 4-wire design with 20-gauge wiring
• Radiused polygon male connector for application-specific connection
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 37.13 in.; overall length: 40.67 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for direct replacement use. Part number 350-34233 is matched to the vehicle application and sensor position so the ECU receives the correct signal from the exhaust stream. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Compatible With 2002-2004 INFINITI I35, downstream rear, and 2002-2003 Nissan Maxima, downstream rear. Use 350-34233 when replacing a rear downstream oxygen sensor on these vehicles and when the original sensor uses the same threaded, heated, 4-wire configuration. Walker 350-34233 is a practical choice for drivers addressing emissions-related fault codes on the I35 or Maxima.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from incorrect air-fuel correction
• Elevated exhaust emissions from a failing downstream sensor
• Stored ECU fault codes tied to the rear oxygen sensor circuit

Installation Notes and Tips

Confirm the downstream rear position before installation, since this sensor is application-specific. Inspect the sensor wiring harness and connector for heat damage, corrosion, or abrasion before replacement. Verify thread size, connector shape, and harness length against the original part to ensure proper routing and fit.

Quality Assurance

Walker Products manufactures engine management sensors as OE-replacement parts and operates under Automotive ISO9001/TS 16949 quality standards. Part number 350-34233 is built for the specified vehicle application and sensor position to support accurate ECU feedback.