Walker 350-34052 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Walker 350-34052 Oxygen Sensor Overview

Walker Products 350-34052 is a heated oxygen sensor built as a specific-fit OE replacement for select Subaru and Toyota applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions performance on downstream applications.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for exact application fitment. The 350-34052 follows that approach with a threaded, 4-wire design and a radiused polygon male connector for direct replacement on listed vehicles.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for listed Subaru and Toyota models
• 4-wire configuration with 20-gauge wiring
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 13.31 in.
• Overall length: 16.85 in.
• Radiused polygon male connector

Detailed Description

The Walker Products 350-34052 oxygen sensor is designed for OE-style replacement on vehicles that rely on accurate downstream exhaust feedback. It is listed for 2021-2024 Subaru Crosstrek, Forester, Impreza, Legacy, and Outback downstream applications, plus additional Subaru and Toyota fitments including 2020-2022 Toyota Yaris and 2020 Toyota Yaris R. This part number also covers multiple Subaru Legacy, Outback, Tribeca, XV, XV Crosstrek, WRX, B9 Tribeca, and related downstream positions where specified.

As a heated sensor, it is built to reach operating temperature quickly and provide the ECU with the signal needed for emissions monitoring and system diagnostics. If the original sensor is failing, the vehicle may store fault codes, run poorly, increase fuel consumption, or illuminate the malfunction indicator light. Part number 350-34052 is intended for exact application matching, so fitment position and connector style should be verified against the vehicle listing before installation.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Rough engine operation caused by inaccurate exhaust feedback
• Increased fuel consumption from incorrect air-fuel control data
• Elevated exhaust emissions from a degraded sensor signal
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Confirm the vehicle position before ordering, especially for Subaru models that use downstream left, downstream right, or bank-specific sensor locations. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation. The threaded mounting style and connector shape should match the original unit for proper replacement. For search relevance, this part is commonly referenced for Subaru Crosstrek downstream oxygen sensor replacement, Subaru Forester downstream O2 sensor service, and Toyota Yaris downstream sensor applications.

Quality Assurance

Walker Products has manufactured engine management components since 1946 and operates as an Automotive ISO 9001 / TS 16949 certified company. The 350-34052 is part of the Walker Products Aftermarket line, which is focused on OE replacement sensor applications for modern vehicle diagnostics. This part cross-references no additional part numbers in the provided data.