Walker 250-54057 Oxygen Sensor - Upstream Front or Upstream Rear

Walker Products OE Oxygen Sensor 250-54057

Walker Products OE 250-54057 is a heated oxygen sensor built for specific vehicle applications and exact mounting positions. It is engineered to deliver the ECU feedback needed for proper fuel control and emissions monitoring on select Toyota and Lexus models.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit design for the listed application and position
• 4-wire configuration with 20-gauge wiring
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for vehicle-specific connection
• Wiring harness length: 10.35; overall length: 13.9

Product Line Details

Walker Products OE is the brand’s original-equipment replacement line for engine management and oxygen/air-fuel sensors. The line is built around application-specific fitment, so the sensor, connector, and harness layout match the vehicle’s required installation position and diagnostic needs.

Detailed Description

This Walker oxygen sensor is designed for vehicles that rely on accurate exhaust feedback to manage air-fuel ratio, emissions output, and fault detection. Part number 250-54057 is listed for 2000-2004 Toyota Avalon, upstream rear; 2001-2003 Toyota Sienna, upstream front; 2001-2003 Toyota Solara, upstream front and upstream rear; 2000-2001 Lexus ES300, upstream front; and 2001 Toyota Camry, upstream front and upstream rear. For shoppers searching for a Toyota Camry oxygen sensor, Toyota Sienna upstream front oxygen sensor, or Lexus ES300 upstream front replacement, this OE-style sensor matches the specified application and position.

Walker Products states that its engine management sensors are developed as OEM replacement parts and that each part number is built for the correct vehicle fitment position. The 250-54057 supports the diagnostic feedback the ECU expects, helping maintain proper system operation on the listed Toyota and Lexus applications. This part number 250-54057 is also a fitment-specific choice for drivers replacing a failed upstream oxygen sensor on the Toyota Avalon, Toyota Solara, or Toyota Camry.

What It Helps Address

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

Installation Notes

Verify the sensor position before installation: upstream front or upstream rear, depending on the vehicle application. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacement. Confirm thread size and connector style match the original part, and clear diagnostic trouble codes after installation if required by the vehicle service procedure.

Quality Assurance

Walker Products is ISO 9001/TS 16949 certified and has supplied engine management and fuel system components since 1946. The OE product line is built around application-specific replacement standards for the listed Toyota and Lexus fitments.