Walker 350-34047 Oxygen Sensor - Upstream

Walker 350-34047 Upstream Oxygen Sensor

Walker Products 350-34047 is a specific-fit heated oxygen sensor engineered as an OE-style replacement for upstream applications. It is built for vehicles that rely on accurate exhaust feedback to help the ECU manage fuel delivery and emissions control.

Compatible With 2004-2005 Buick Rainier, 2004-2005 Chevrolet Colorado, 2004-2005 Chevrolet Trailblazer, 2004-2005 Chevrolet Trailblazer EXT, 2004-2005 GMC Canyon, 2004-2005 GMC Envoy, 2004-2005 GMC Envoy XL, 2004-2005 GMC Envoy XUV, 2004-2005 Isuzu Ascender, 2005 Saab 9-7x, and 2004 Oldsmobile Bravada in the upstream position.

Key Features

• Part number 350-34047 for upstream oxygen sensor replacement
• Heated sensor design for faster operating temperature
• Specific-fit application for direct vehicle matching
• 4-wire configuration with female connector
• Radiused polygon connector shape for application-specific fitment
• Threaded mounting with 18.0 mm thread diameter
• 16.46 in. wiring harness length and 20-gauge wire
• Overall length: 20.0 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for defined vehicle applications. The 350-34047 is intended for upstream placement where the sensor provides feedback used by the ECU to adjust air-fuel control and monitor emissions performance. Walker Products has supplied engine management and fuel system components since 1946 and manufactures to ISO 9001/TS 16949 standards.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine or malfunction indicator 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 upstream sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes

Verify the sensor location before installation; this part is for upstream use only. Inspect the sensor, wiring harness, and connector for physical damage before replacement, since damaged wiring can shorten service life and affect ECU feedback. Confirm thread size, connector style, and harness length against the original part on the vehicle.

Quality Assurance

Walker Products manufactures this oxygen sensor as a specific application replacement with ECU-relevant feedback in mind. The brand’s ISO 9001/TS 16949 certification supports consistent production control for engine management components.