Walker 350-34304 Oxygen Sensor - Downstream Front or Downstream Rear

Walker 350-34304 Oxygen Sensor Overview

Walker Products 350-34304 is a heated oxygen sensor built as a specific-fit OE replacement for select Hyundai and Kia applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions performance.

Compatible With 2002-2010 Hyundai Sonata, Tucson, Tiburon, Santa Fe, and 2003-2010 Kia Optima, Magentis, Sportage applications in downstream front, downstream rear, and downstream right positions.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• Specific-fit design for the listed vehicle, engine management, and sensor position
• 4-wire configuration with 20-gauge wiring
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for application-specific connection
• Wiring harness length: 23.15; overall length: 26.69

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered as OE-style replacements for worldwide vehicle coverage. Part number 350-34304 is manufactured for the correct application and mounting position so the sensor can provide the ECU with the feedback needed for closed-loop fuel control and emissions monitoring. This part number is listed for multiple Hyundai Sonata, Tucson, Tiburon, and Santa Fe applications, as well as Kia Optima, Magentis, and Sportage models, including downstream front, downstream rear, and downstream right locations. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

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 affected sensor circuit

Installation Notes and Tips

Confirm the exact position before installation, since this sensor is listed for downstream front, downstream rear, and downstream right locations depending on the vehicle. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacement. Verify thread size and connector style against the original part, and clear diagnostic trouble codes after installation if required by the repair procedure.

Quality Assurance

Walker Products is an Automotive ISO9001/TS 16949 certified company with a long history in engine management and fuel system components. Part number 350-34304 is built for specific vehicle fitment and ECU feedback requirements, supporting consistent replacement quality for the listed Hyundai and Kia applications.