Walker 250-54058 Oxygen Sensor - Upstream

Overview of Walker 250-54058 Oxygen Sensor

The Walker 250-54058 oxygen sensor is designed specifically for select Saab and Subaru models, including the 9-2X, Baja, Forester, Impreza, Legacy, Outback, and WRX STI. This heated oxygen sensor features a threaded mounting type and a radiused polygon male connector, ensuring precise fitment and reliable performance.

• Heated oxygen sensor with 4 wires for accurate readings
• Specific fit for Saab 9-2X and Subaru models like Forester and WRX STI
• 29.06-inch wiring harness length for flexible installation
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for secure connection
• Wire gauge measurement of 20 for durability and signal integrity
• Overall length of 32.6 inches to accommodate engine bay layout

Walker Products OE Line Details

This oxygen sensor is part of the Walker Products OE line, which focuses on delivering original equipment quality and fitment. The OE line ensures that each sensor meets or exceeds factory specifications, providing compatibility and performance tailored to the vehicle’s emission control system requirements.

Product Description and Attributes

The Walker 250-54058 oxygen sensor is a heated sensor designed to provide accurate air-fuel mixture data to the engine control unit. It features a 4-wire configuration with a 20-gauge wire size, which supports efficient heating and signal transmission. The sensor’s wiring harness length of 29.06 inches and overall length of 32.6 inches allow for proper routing and installation in the engine compartment. The threaded mounting type with an 18.0 mm diameter ensures a secure fit in the exhaust system. The radiused polygon male connector is engineered for a precise and reliable electrical connection, reducing the risk of sensor failure due to poor contact.

Compatible Vehicles and Applications

• Saab 9-2X oxygen sensor replacement
• Subaru Forester and Baja emission control sensor
• Subaru Impreza and WRX STI oxygen sensor upgrade
• Subaru Legacy and Outback sensor fitment

Common Issues Addressed by This Oxygen Sensor

• Incorrect air-fuel mixture readings causing poor fuel economy
• Check engine light triggered by faulty oxygen sensor signals
• Increased emissions due to sensor malfunction
• Engine performance issues related to sensor failure
• Failed emissions tests requiring sensor replacement

Installation Notes and Tips

Ensure the engine is cool before beginning installation to avoid burns. Use the correct 18.0 mm socket for removing and installing the sensor. Verify the connector shape and gender match the vehicle’s wiring harness to prevent connection issues. Route the wiring harness carefully to avoid contact with hot exhaust components or moving parts. After installation, clear any diagnostic trouble codes and perform a test drive to confirm proper sensor operation.

Quality Assurance and Warranty

Walker Products OE oxygen sensors are manufactured to meet original equipment standards, ensuring reliable performance and durability. While specific warranty details may vary, Walker typically offers coverage against defects in materials and workmanship. Refer to the product documentation or manufacturer for exact warranty terms.