Walker 250-25163 Oxygen Sensor

Walker OE Base Sensor for Precise Fuel Control

Walker OE Base Sensor 250-25163 is a heated wide-band oxygen sensor built for specific vehicle applications and exact fitment positions. It provides the ECU with the feedback needed to monitor air-fuel ratio and emissions performance on supported Ford, Lincoln, Kia, Hyundai, and related applications.

The OE Base Sensor line from Walker Products focuses on application-specific replacement sensors, with fitment matched to the vehicle position and connector style. That makes 250-25163 a direct-fit choice for upstream and upstream rear locations where accurate sensor response is critical.

Key Features

• Heated wide-band oxygen sensor for fast operating temperature
• Specific-fit design for the listed vehicle applications
• 5-wire sensor with oblong female connector
• 6-terminal configuration with male terminals
• M18 x 1.5 thread size and 22 mm wrench size
• Supports ECU feedback for air-fuel and emissions monitoring

Detailed Product Overview

Walker 250-25163 is engineered as an OE-style replacement oxygen sensor for vehicles that rely on precise upstream or upstream rear signal input. It is listed for applications such as the Ford Fusion, Ford Focus, Ford Escape, Ford F-150, Lincoln MKZ, Kia Forte, Kia Optima, and Hyundai Elantra, along with additional Ford and Lincoln models. If you are searching for a replacement oxygen sensor for a 2011-2020 Ford Fusion upstream B1S1, a 2010-2016 Ford F-150 upstream right, or a 2016-2019 Ford Explorer upstream rear, this part number is built for those exact positions.

Walker Products has supplied engine management and oxygen/air-fuel sensors since 1946, and the OE Base Sensor line is organized around application-specific fitment rather than universal coverage. Part number 250-25163 is also referenced for 2022-2024 Kia Forte upstream, 2013-2020 Lincoln MKZ upstream, and 2014-2019 Ford Fiesta upstream service needs.

Common Problems This Sensor Can Address

• Check engine light related to oxygen sensor or air-fuel sensor faults
• Poor engine performance caused by inaccurate exhaust feedback
• Increased fuel consumption from incorrect mixture control
• Higher exhaust emissions from delayed or faulty sensor response
• Diagnostic trouble codes stored in the ECU for sensor-related issues

Installation Notes and Tips

Verify the connector shape, wire count, terminal style, thread size, and sensor position before installation. Inspect the sensor harness and connector for heat damage, corrosion, or broken terminals, since wiring issues can shorten sensor life and trigger fault codes. Confirm the exact application by year, make, model, and position before ordering 250-25163.

Quality Assurance

Walker Products manufactures engine management sensors as OE replacement components for specific applications and supports them with ISO 9001/TS 16949 manufacturing practices. The OE Base Sensor line is built to match the vehicle’s required diagnostic feedback and fitment position.