Walker 350-35173 Oxygen Sensor - Upstream

OE Replacement Oxygen Sensor

Walker 350-35173 is a specific-fit oxygen sensor built as an OE replacement for the upstream position. It is engineered for the diagnostic feedback the ECU expects, making it a direct match for vehicles that require a wide-band, heated sensor.

• Specific-fit oxygen sensor for targeted application coverage.
• Wide-band sensor design for accurate air-fuel monitoring.
• Heated construction for faster operating response.
• Threaded mounting with M18 x 1.5 thread size.
• Female D-shape connector with 5-wire harness and blade terminals.

Detailed Product Overview

Walker Products developed this sensor as an Original Equipment replacement for the upstream application, with fitment and connector details matched to the vehicle’s diagnostic system requirements. The 350-35173 uses a threaded mount, 7/8-inch wrench size, and a 610 mm overall length, along with a 585 mm harness length for proper routing. As a wide-band oxygen sensor, it supports precise feedback to the ECU on the Hyundai Elantra application listed here.

Walker 350-35173 is a practical choice when replacing a sensor that has triggered fault codes, poor fuel economy, elevated emissions, or a malfunction indicator light. It is also relevant when the sensor wiring, connector, or harness shows wear or damage. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Fault codes related to oxygen sensor performance.
• Rough engine operation caused by incorrect air-fuel feedback.
• Increased fuel consumption from inaccurate sensor readings.
• Higher exhaust emissions from a failing upstream sensor.
• Malfunction indicator light illumination tied to sensor faults.

Installation Notes and Tips

Verify the upstream location, connector shape, terminal count, and thread size before installation. Inspect the sensor wiring harness and connector for physical damage before replacing the part. Confirm the application matches the Hyundai Elantra 2021-2024 listing for Walker 350-35173.

Quality Assurance

Walker Products manufactures this OE Replacement sensor as a standard replacement part and builds its engine management components under ISO 9001/TS 16949 quality systems. The brand has supplied engine management and fuel system components since 1946.