Walker 250-54131 Oxygen Sensor - Upstream

OE Base Wide-Band Oxygen Sensor

Walker OE Base Sensor 250-54131 is a specific-fit, heated wide-band oxygen sensor built for direct replacement in select Toyota and Lexus applications. It delivers the ECU feedback needed for accurate air-fuel control, helping maintain proper engine management on vehicles such as the Toyota Corolla and Lexus UX series.

Key Features

• Specific-fit oxygen sensor for targeted vehicle applications
• Heated wide-band design for responsive exhaust monitoring
• 4-wire configuration with square female connector
• 4 terminals, male terminal ends, pin-style terminal type
• M18 x 1.5 thread size with 22 mm wrench size
• Upstream position application
• Walker OE Base Sensor line for OE-style replacement coverage

Product Details

Walker Products 250-54131 is engineered as an OE replacement oxygen sensor for vehicles that rely on precise upstream exhaust feedback. This sensor is listed for 2019-2024 Toyota Corolla upstream, 2019-2022 Lexus UX200 upstream, and 2019-2021 Lexus UX250h upstream, including 2022-2024 Lexus UX250h upstream and B1S1 applications. If you are searching for an upstream oxygen sensor for Toyota Corolla or a Lexus UX250h oxygen sensor replacement, this part number is built around the original application requirements rather than a universal design.

The OE Base Sensor line focuses on application-specific fitment and diagnostic signal accuracy. Walker Products has supplied engine management and oxygen/air-fuel sensors for decades, with manufacturing aligned to ISO 9001/TS 16949 quality systems. Part number 250-54131 is intended for vehicles that need a heated wide-band sensor with the correct connector, thread, and terminal layout for the ECU to read exhaust conditions properly.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Poor fuel economy caused by inaccurate air-fuel feedback
• Rough engine operation from incorrect exhaust sensor readings
• Increased exhaust emissions from a failing sensor
• Fault codes stored in the ECU for sensor or related system faults

Installation Notes and Tips

Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear. Confirm the upstream location, connector shape, terminal count, and thread size match the original sensor before installation. For best results, verify the vehicle application by year, make, model, and position: Fits 2019-2024 Toyota Corolla, upstream; Fits 2019-2022 Lexus UX200, upstream; Fits 2019-2024 Lexus UX250h, upstream.

Quality Assurance

Walker Products manufactures engine management sensors for OE-style replacement applications and supports its catalog with ISO 9001/TS 16949 quality processes. Part number 250-54131 is built for specific fitment and diagnostic feedback requirements in the listed Toyota and Lexus applications.