Walker 350-33049 Oxygen Sensor - Downstream, Upstream, Upstream Left or Upstream Right

Walker 350-33049 Oxygen Sensor for Subaru

Walker Products 350-33049 is a heated oxygen sensor built as a specific-fit OE replacement for select Subaru applications. It is designed to provide the ECU with the feedback needed for accurate fuel control and emissions monitoring on upstream positions.

Key Features

• Heated oxygen sensor for upstream placement
• Specific-fit design for direct application matching
• 3-wire configuration with 20-gauge wiring
• Radiused polygon male connector for vehicle-specific connection
• Threaded mounting with 18.0 mm thread diameter
• Overall length: 19.21 in.; wiring harness length: 15.67 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered as OE-style replacements for a wide range of vehicles. Part number 350-33049 is built for upstream oxygen sensor service on Subaru Impreza and Subaru Legacy models listed below, including 1990-1994 Subaru Legacy, upstream, and 1993-1995 Subaru Impreza, upstream. This sensor is intended to restore proper diagnostic feedback to the ECU when the original sensor has aged, become contaminated, or failed electrically.

Walker Products has supplied engine management components since 1946 and manufactures to automotive ISO9001/TS 16949 standards. The brand line is centered on application-specific sensors and fuel system parts, with fitment and connector design matched to the vehicle platform for straightforward replacement service. This part number, 350-33049, is a direct-fit oxygen sensor for the listed Subaru applications.

Common Issues This Sensor May Address

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

Installation Notes and Tips

Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear. Confirm the threaded mounting location and upstream position on the vehicle before installation. For Subaru Impreza and Subaru Legacy applications, verify the connector shape and wire count against the original sensor to ensure proper fitment. If the vehicle has stored fault codes, clear them after installation and confirm normal ECU feedback.

Quality Assurance

Walker Products manufactures engine management sensors as OE-style replacements and supports them with automotive-grade production standards. The 350-33049 is built for specific application fitment and diagnostic system feedback requirements on the listed Subaru models.