Walker 350-34051 Oxygen Sensor - Downstream

Walker 350-34051 Oxygen Sensor for Ford Focus

Walker Products 350-34051 is a heated oxygen sensor built as a specific-fit OE replacement for select Ford Focus applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring.

Compatible With 2003-2007 Ford Focus, downstream positions including Bank 1 Sensor 3 applications. The Walker Products Aftermarket line focuses on application-specific engine management and oxygen/air-fuel sensors for direct replacement use.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for the listed Ford Focus applications
• 4-wire configuration with male radiused polygon connector
• 18.0 mm thread diameter and threaded mounting type
• Wiring harness length: 13.31 in.; overall length: 16.85 in.
• Walker Products part number 350-34051

Detailed Description

Walker Products 350-34051 is designed for vehicles that rely on downstream oxygen sensor feedback to monitor catalyst performance and emissions-related operation. For 2003-2007 Ford Focus models, this sensor is listed for downstream use, including Bank 1 Sensor 3 coverage noted in the fitment data. If your Ford Focus has a stored fault code tied to the oxygen sensor circuit, poor fuel economy, rough running, or an illuminated MIL, this replacement sensor addresses the affected monitoring point directly. The part number 350-34051 is built for the specified application and connector style, helping maintain the correct ECU signal on the listed vehicles.

What It Can Help Resolve

• Oxygen sensor fault codes in the ECU
• Illuminated malfunction indicator light related to downstream sensor operation
• Rough engine performance caused by inaccurate exhaust feedback
• Increased fuel consumption from incorrect air-fuel control input
• Elevated exhaust emissions from a failing sensor circuit

Installation Notes and Tips

Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals. Confirm the downstream mounting location and connector match the vehicle before installation. Because this is a threaded sensor, proper removal and installation tools help reduce the risk of exhaust thread damage. Verify the fault code and clear stored codes after installation if required by the vehicle’s diagnostic procedure.

Quality Assurance

Walker Products has supplied engine management and oxygen sensor components since 1946 and manufactures application-specific replacement parts for the listed fitment. The brand is ISO 9001/TS 16949 certified, supporting consistent production and diagnostic feedback requirements for modern ECU-controlled systems.