Walker 350-34576 Oxygen Sensor - Upstream

Walker 350-34576 Oxygen Sensor for Ford Focus

Walker Products 350-34576 is a specific-fit heated oxygen sensor engineered as an OE-style replacement for the vehicle application it was built for. It is designed to deliver the ECU feedback needed for accurate fuel control and emissions monitoring on 2003-2007 Ford Focus upstream positions.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit for the intended vehicle application
• 4-wire design with a male connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 15.67 in.
• Overall length: 19.21 in.
• Walker Products Aftermarket engine management sensor line

Product Details

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors built for direct replacement use. Part number 350-34576 is made for upstream placement and is intended to restore proper sensor feedback to the ECU on Ford Focus models from 2003 through 2007. This oxygen sensor supports emissions system monitoring and air-fuel control, making it a practical choice when diagnosing a fault code or replacing a worn sensor on a Ford Focus upstream oxygen sensor application. Walker Products 350-34576 is also a relevant search match for buyers looking for a 2003-2007 Ford Focus upstream oxygen sensor or a Ford Focus Bank 1 Sensor 1 replacement.

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

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from incorrect air-fuel correction
• Increased exhaust emissions from a failing sensor
• Diagnostic trouble codes tied to the sensor circuit or related systems

Installation Notes

Verify the upstream position before installation and compare the connector, wire count, and thread size to the original sensor. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacement. Confirm the Ford Focus application by year and engine management configuration, and clear stored fault codes after installation if required by the repair procedure.

Quality Assurance

Walker Products manufactures engine management sensors as OE-replacement parts for specific applications and fitment positions. The brand states its sensors are developed for ECU feedback requirements and produced under ISO 9001/TS 16949 quality systems.