Walker 250-54051 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

OE Oxygen Sensor for Toyota Upstream Applications

Walker Products OE oxygen sensor Part Number 250-54051 is a specific-fit heated sensor engineered for upstream exhaust monitoring on select Toyota trucks and SUVs. It is built to deliver the ECU feedback needed for accurate fuel control and emissions management on 2000-2004 Toyota Tacoma, 2000-2004 Toyota Tundra, and 1999-2004 Toyota 4Runner applications.

Key Features

• Heated oxygen sensor for upstream placement
• Specific-fit design for direct application matching
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector for vehicle-side compatibility
• 18.0 mm thread diameter and flange mount design
• Overall length: 13.31 in.; wiring harness length: 9.76 in.
• Walker Products OE part number 250-54051

Walker Products OE Line

Walker Products OE focuses on original-equipment-style engine management components, including oxygen and air-fuel sensors built for application-specific fitment. Part Number 250-54051 follows that OE replacement approach for Toyota Tacoma, Toyota Tundra, and Toyota 4Runner upstream sensor locations, with the correct connector style, mounting type, and sensor configuration for the listed vehicles.

Detailed Description

This heated oxygen sensor is designed for upstream exhaust monitoring, where the ECU relies on sensor feedback to help manage air-fuel ratio and emissions performance. For Toyota Tacoma, Toyota Tundra, and Toyota 4Runner models in the listed years, Walker Products OE 250-54051 provides the correct specific-fit configuration for the application and position. It is a practical replacement choice when diagnosing a failed upstream sensor, a MIL light, poor fuel economy, elevated emissions, or drivability concerns tied to oxygen sensor feedback.

This part cross-references no listed aftermarket part numbers in the provided data.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Rough running or inconsistent fuel control
• Increased fuel consumption from inaccurate exhaust feedback
• Elevated exhaust emissions
• Fault codes stored in the ECU for sensor-related issues

Installation Notes and Tips

• Confirm the vehicle is one of the listed Toyota applications before ordering.
• Match the sensor position exactly: upstream, upstream right, or upstream left as shown in the fitment data.
• Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation.
• Verify the flange mount and 18.0 mm thread diameter match the original sensor location.
• Use the vehicle’s diagnostic trouble codes and service information to confirm the affected sensor circuit.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacement parts and manufactured under Automotive ISO9001/TS 16949 quality systems. Since 1946, the brand has supplied engine management and fuel system components for vehicle applications worldwide.

Fitment

• Fits 2001-2004 Toyota Tacoma, upstream.
• Fits 2001-2004 Toyota Tacoma, upstream.
• Fits 2001-2004 Toyota Tacoma, upstream.
• Fits 2001-2004 Toyota Tundra, upstream.
• Fits 2001-2002 Toyota 4Runner, upstream.
• Fits 1999-2000 Toyota 4Runner, upstream.
• Fits 2000 Toyota 4Runner, upstream.
• Fits 2000 Toyota 4Runner, upstream.
• Fits 2000 Toyota Tacoma, upstream.
• Fits 2000 Toyota Tacoma, upstream.
• Fits 2000 Toyota Tacoma, upstream.
• Fits 2000 Toyota Tundra, upstream right.
• Fits 2000 Toyota Tundra, upstream left.