Walker 250-54003 Oxygen Sensor - Upstream Front or Upstream Rear

Overview of Walker Products OE Oxygen Sensor 250-54003

The Walker Products OE Oxygen Sensor 250-54003 is designed specifically for select Lexus and Toyota models, including the Avalon, ES300, and Sienna. This heated oxygen sensor ensures accurate emissions control and optimal engine performance by providing precise air-fuel mixture data.

• Heated oxygen sensor with 4-wire design for reliable operation
• Specific fit for Lexus Avalon, Toyota ES300, and Sienna models
• Threaded mounting type with 18.0 mm thread diameter for secure installation
• 15.28-inch wiring harness length with 20-gauge wire for durability
• Radiused polygon male connector for proper electrical connection
• Overall length of 18.82 inches to accommodate factory specifications

Detailed Product Description

This Walker Products OE oxygen sensor (part number 250-54003) features a heated sensor element that allows for faster warm-up times and improved emissions monitoring. The 4-wire configuration includes two wires for the heating element and two for the sensor signal, ensuring accurate and stable readings. The sensor’s 15.28-inch wiring harness and 20-gauge wire gauge provide sufficient length and durability for installation in the engine bay. Its radiused polygon male connector matches factory connectors for a secure and reliable electrical connection. The threaded mounting type with an 18.0 mm diameter ensures compatibility with the exhaust system of Lexus Avalon, Toyota ES300, and Sienna vehicles. The overall length of 18.82 inches is designed to meet OEM specifications, facilitating a proper fit and function.

Walker Products OE Brand Line Information

The Walker Products OE line focuses on delivering emission control components that meet original equipment standards. This oxygen sensor is engineered to match the fit, form, and function of the factory-installed sensor, providing consistent performance and durability. By adhering to OE specifications, Walker Products OE sensors help maintain vehicle emissions compliance and engine efficiency.

Common Applications and Issues Addressed

• Restores accurate air-fuel ratio readings for improved fuel economy
• Resolves check engine light triggers related to oxygen sensor faults
• Helps reduce harmful emissions by ensuring proper catalytic converter function
• Eliminates rough idling or engine hesitation caused by faulty sensors
• Prevents failed emissions tests due to sensor malfunctions

Installation Notes and Tips

• Ensure the vehicle is cool before removing the old sensor to avoid burns
• Use an oxygen sensor socket or appropriate tool for removal and installation
• Do not over-tighten; torque to manufacturer specifications for the 18.0 mm threaded sensor
• Verify connector compatibility with the radiused polygon male plug before installation
• Inspect wiring harness for damage and secure routing to prevent chafing

Quality Assurance and Warranty

Walker Products OE oxygen sensors are manufactured to meet strict quality standards and undergo rigorous testing to ensure reliability and durability. This part number 250-54003 is backed by Walker’s quality assurance protocols, providing confidence in its performance for Lexus Avalon, Toyota ES300, and Sienna vehicles. Warranty details are available through authorized distributors and should be confirmed at the time of purchase.