Walker 350-341127 Oxygen Sensor - Downstream

OE Replacement Oxygen Sensor for Subaru and Toyota

Walker OE Replacement oxygen sensor 350-341127 is a direct-fit, downstream narrow-band sensor built for specific vehicle applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring on supported Subaru, Scion, and Toyota models.

Key Features

• Heated narrow-band oxygen sensor for downstream placement
• Specific-fit design for application-matched installation
• 4-wire configuration with square connector and male spade terminals
• Threaded M18 x 1.5 mounting with 22 mm wrench size
• Standard replacement grade for OE-style service
• Overall length: 583 mm

Product Details

Walker Products OE Replacement sensors are built for the exact application, fitment position, and diagnostic feedback required by the vehicle ECU. This 350-341127 oxygen sensor is a downstream unit used in emissions control systems on select Subaru WRX STI, Subaru BRZ, Toyota 86, Scion FR-S, and Subaru WRX applications. As a heated narrow-band sensor, it supports closed-loop monitoring after the catalytic converter and helps maintain accurate exhaust feedback for the engine management system.

The Walker OE Replacement line focuses on application-specific engine management components for modern vehicles. For shoppers searching for a Subaru BRZ downstream oxygen sensor, a Toyota 86 B1S2 sensor, or a Subaru WRX STI downstream O2 sensor, part number 350-341127 provides the correct OE-style fitment for the listed vehicles.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from faulty sensor input
• Elevated exhaust emissions from a worn downstream sensor
• Diagnostic trouble codes stored in the ECU for sensor-related faults

Installation Notes and Tips

Verify the connector shape, wire count, thread size, and downstream position before installation. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear, since damaged wiring can shorten sensor life and affect operation. Confirm the vehicle application by year, make, model, and position before ordering. This part cross-references no listed aftermarket part numbers for the same application.

Quality Assurance

Walker Products manufactures engine management and oxygen/air-fuel sensors as OE replacement parts for specific applications worldwide. The company is ISO 9001/TS 16949 certified and has produced automotive fuel system and sensor components since 1946. Part number 350-341127 is built to support the diagnostic feedback expected by the vehicle ECU on the listed Subaru, Scion, and Toyota applications.