Walker 250-54128 Oxygen Sensor - Upstream Front or Upstream Left

Walker Products OE Oxygen Sensor for Toyota Highlander

Walker Products OE Part Number 250-54128 is an oxygen sensor engineered as an OE-style replacement for specific Toyota Highlander applications. It is built for the sensor location and diagnostic feedback required by the vehicle ECU, helping maintain proper engine management on 2020-2022 Highlander models.

Key Features

• OE-style oxygen sensor for emission control system service
• Application-specific fitment for the correct mounting position
• Supports ECU feedback for accurate air-fuel and exhaust monitoring
• Designed for 2020-2022 Toyota Highlander upstream sensor locations
• Walker Products OE line for engine management and sensor replacement
• Part number 250-54128 for direct application lookup

Product Details

Walker Products OE 250-54128 is made for Toyota Highlander upstream oxygen sensor service, including 2020 Highlander, upstream front; 2021 Highlander, upstream front; and 2022 Highlander, upstream left. The sensor is intended to restore the diagnostic signal the ECU relies on to manage fuel delivery and emissions performance. Walker Products OE focuses on application-specific replacement parts, and this sensor follows that approach for the listed Highlander fitments.

This part cross-references no listed interchange numbers for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from incorrect air-fuel control data
• Elevated exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes

Verify the sensor position before installation: this part is listed for upstream front and upstream left locations on the Toyota Highlander. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear before replacing the unit. Confirm the fault code and application match the vehicle year, make, model, and sensor position.

Quality Assurance

Walker Products states that its engine management and oxygen/air-fuel sensors are developed as OE replacement parts and manufactured under ISO 9001/TS 16949 quality systems. The Walker Products OE line is built around application-specific fitment and ECU feedback requirements.