Walker 350-64037 Oxygen Sensor - Upstream

Walker 350-64037 Oxygen Sensor Overview

Walker Products 350-64037 is a heated, specific-fit oxygen sensor engineered as an OE-style replacement for select 2005 Saab 9-2X and Subaru applications. It is built for upstream placement and provides the ECU with the feedback needed to monitor air-fuel control and emissions performance.

• Heated oxygen sensor for faster operating temperature
• Specific-fit design for the listed vehicle applications
• 4-wire configuration with female radiused polygon connector
• Threaded mounting style with 18.0 mm thread diameter
• Wiring harness length: 16.26 in.; wire gauge: 20
• Overall length: 19.8 in.

Walker Products Aftermarket Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed for direct replacement use. Part number 350-64037 is designed for the specified fitment position and vehicle calibration needs, helping maintain the diagnostic feedback expected by the ECU. This part cross-references no listed alternate part numbers in the provided data.

Vehicle Fitment

• Fits 2005 Saab 9-2X, upstream. Bank 1 Sensor 1 needs an upstream oxygen sensor; front oxygen sensor compatible with various vehicle models.
• Fits 2005 Subaru Forester, upstream. Bank 1 Sensor 1 needs an upstream oxygen sensor; front oxygen sensor compatible with various vehicle models.
• Fits 2005 Subaru Impreza, upstream. Bank 1 Sensor 1 needs an upstream oxygen sensor; front oxygen sensor compatible with various vehicle models.
• Fits 2005 Subaru Legacy, upstream. Compatible with California-ESV vehicles, upstream oxygen sensor; non-California emissions certified Bank 1 Sensor 1; not suitable for California emissions-certified vehicles; for vehicles without California and Federal emissions.
• Fits 2005 Subaru Outback, upstream. Non-California emissions certified Bank 1 Sensor 1; not suitable for California emissions-certified vehicles; for vehicles without California and Federal emissions.

What This Sensor Helps Address

• Check engine light related to upstream oxygen sensor faults
• Poor engine performance caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate sensor readings
• Higher exhaust emissions from a failing oxygen sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Quality

Confirm the upstream position, connector shape, wire count, and emissions calibration before installation. Inspect the sensor wiring harness and connector for physical damage, since damaged wiring can shorten service life and affect signal quality. Walker Products manufactures this sensor as an OE-replacement part under ISO 9001/TS 16949 quality systems for engine management applications.