Walker 250-54027 Oxygen Sensor - Upstream

Overview of Walker 250-54027 Oxygen Sensor for Saab and Subaru

The Walker 250-54027 oxygen sensor is designed specifically for select Saab and Subaru models, including the 9-2X, Forester, Impreza, Legacy, and Outback. This heated oxygen sensor ensures accurate emissions control and optimal engine performance by monitoring exhaust gases effectively.

• Heated oxygen sensor with 4-wire configuration
• Specific fit for Saab 9-2X and Subaru Forester, Impreza, Legacy, Outback
• Threaded mounting type with 18.0 mm thread diameter
• 20.2-inch wiring harness length and 23.74-inch overall length
• Radiused polygon female connector for secure connection
• Wire gauge measurement of 20 for reliable signal transmission

Detailed Features and Specifications

This Walker Products OE oxygen sensor (part number 250-54027) features a heated sensor type that allows for quicker activation and more accurate readings under various operating conditions. The sensor includes a 4-wire design, which supports both the heating element and signal wires, ensuring consistent performance. The wiring harness length of 20.2 inches and overall length of 23.74 inches provide sufficient reach for installation in the specified vehicle models. The sensor mounts via a threaded connection with an 18.0 mm diameter, compatible with the exhaust system fittings of Saab 9-2X and Subaru Forester, Impreza, Legacy, and Outback models. The radiused polygon female connector ensures a secure and precise electrical connection, reducing the risk of signal loss or disconnection.

Walker Products OE Brand Line Information

The Walker Products OE line focuses on delivering emission control components that meet original equipment specifications. This oxygen sensor is engineered to match the fit, form, and function of the factory-installed sensor, providing reliable emissions monitoring and helping maintain compliance with environmental standards. Using a Walker Products OE sensor like the 250-54027 supports proper engine management and fuel efficiency in Saab and Subaru vehicles.

Common Applications and Issues Addressed

• Helps resolve engine performance issues related to incorrect air-fuel mixture
• Reduces emissions by providing accurate oxygen level readings
• Prevents check engine light triggers caused by faulty sensors
• Improves fuel economy by enabling precise fuel injection adjustments
• Supports proper catalytic converter operation and longevity

Installation Notes and Tips

When installing the Walker 250-54027 oxygen sensor, ensure the vehicle is cool to avoid burns. Use appropriate tools to remove the old sensor and avoid damaging the threaded mounting hole. Verify the connector type matches the vehicle harness before installation. The 4-wire heated sensor requires proper wiring connections to function correctly. After installation, clear any diagnostic trouble codes and perform a test drive to confirm sensor operation.

Quality Assurance and Warranty

Walker Products OE oxygen sensors are manufactured to meet strict quality standards and original equipment specifications. While specific warranty details for part number 250-54027 should be confirmed with the supplier, Walker typically offers coverage against defects in materials and workmanship to ensure dependable performance in Saab and Subaru vehicles.