Walker 250-54078 Oxygen Sensor - Upstream Rear

Walker Products OE Oxygen Sensor for Toyota RAV4

Walker Products OE Part Number 250-54078 is a heated oxygen sensor built for specific vehicle fitment and exhaust sensor placement. It is engineered as an OE-style replacement for the 2001-2003 Toyota RAV4, Upstream Rear, with the connector, harness length, and threaded mounting style matched to the application.

Key Features

• Fits 2001-2003 Toyota RAV4, Upstream Rear
• Heated oxygen sensor design for faster operating response
• Specific-fit application for direct replacement use
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector for vehicle-specific connection
• 18.0 mm thread diameter with threaded mounting type
• Overall length: 12.91 in.; wiring harness length: 9.37 in.

Product Details

Walker Products OE 250-54078 is part of the Walker Products OE line, which focuses on application-specific engine management and oxygen/air-fuel sensors. For the Toyota RAV4, this sensor is built to match the required fitment position and provide the diagnostic feedback the ECU expects from the upstream rear exhaust location. The heated design helps the sensor reach operating temperature efficiently, supporting accurate exhaust monitoring on the 2001-2003 Toyota RAV4.

This part number, 250-54078, is intended for direct replacement in the specified Toyota RAV4 applications and is built around the listed connector shape, wire count, and threaded mounting dimensions. Walker Products has supplied engine management and fuel system components since 1946 and manufactures sensors to OE-style application requirements.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel monitoring
• Higher exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes

Confirm the vehicle is a 2001-2003 Toyota RAV4 with the Upstream Rear sensor position before ordering. Inspect the sensor wiring harness and connector for damage during diagnosis, since physical wear can shorten sensor life and affect signal quality. Verify thread diameter, connector style, and harness length against the original part before installation. Part number 250-54078 is a specific-fit sensor and should be matched to the listed application only.

Quality Assurance

Walker Products OE sensors are manufactured for application-specific fitment and ECU feedback requirements. The brand operates under Automotive ISO9001/TS 16949 quality systems and has long-standing experience in engine management sensor production. This part cross-references no additional part numbers in the provided data.