Walker 350-34831 Oxygen Sensor

Walker 350-34831 Oxygen Sensor Overview

Walker Products 350-34831 is an OE replacement oxygen sensor for specific Toyota and Lexus applications. It is engineered for the exact application and sensor position, helping the ECU receive the feedback it expects from the exhaust system.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for direct-fit replacement needs across a wide range of vehicles, including Toyota Camry, Tacoma, Highlander, Avalon, and Lexus ES350 applications.

Key Features

• OE replacement oxygen sensor for downstream locations
• Application-specific fitment and connector positioning
• Supports ECU diagnostic feedback on equipped vehicles
• Designed for select Toyota and Lexus models
• Walker Products part number 350-34831

Detailed Description

The Walker 350-34831 oxygen sensor is built for downstream use on confirmed Toyota and Lexus fitments. This sensor is matched to the listed vehicle, model year, and position so it can deliver the diagnostic signal the engine control unit relies on for emissions and fuel-control monitoring. For shoppers searching for a downstream oxygen sensor for Toyota Camry, Lexus ES350 oxygen sensor replacement, or a Walker 350-34831 direct-fit sensor, this part is listed for the exact applications shown below.

Walker Products has supplied engine management components since 1946 and manufactures sensors to OE-style application requirements. The 350-34831 is intended for vehicles where the original sensor has triggered fault codes, poor running conditions, higher fuel use, increased emissions, or a malfunction indicator light.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Fault codes stored in the ECU for downstream sensor circuits
• Rough engine operation tied to exhaust feedback errors
• Increased fuel consumption from inaccurate sensor readings
• Elevated exhaust emissions from a failing sensor

Installation Notes and Tips

• Verify the exact year, make, model, and sensor position before ordering.
• Inspect the sensor wiring harness and connector for heat damage or corrosion before installation.
• Confirm the downstream location shown in the fitment list, including left, right, front, or rear placement where specified.
• For 2016 Toyota Tacoma applications, review the B1S2 and production-date notes carefully.
• For 2019-2021 Lexus ES350 applications, confirm whether the vehicle is Japan-built or USA-built.

Quality Assurance

Walker Products manufactures engine management sensors under ISO 9001/TS 16949 quality systems, with application-specific development for OE-style replacement use. Part number 350-34831 is listed for confirmed downstream oxygen sensor applications on select Toyota and Lexus vehicles.