Walker 350-35048 Oxygen Sensor - Upstream

Walker 350-35048 Oxygen Sensor Overview

Walker Products 350-35048 is a heated upstream oxygen sensor built as an OE replacement for specific Mazda, Toyota, and Scion applications. It is engineered for the correct fitment position and ECU feedback needed to monitor air-fuel performance on the vehicle.

For drivers searching for an upstream oxygen sensor for Mazda 3, Mazda CX-5, Mazda 6, or Toyota Yaris applications, this Walker Products Aftermarket sensor is designed around the original mounting and connector requirements.

Key Features

• Heated oxygen sensor for upstream placement
• Specific-fit design for direct application matching
• 5-wire configuration with 20-gauge wiring
• Radiused polygon male connector for proper harness connection
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 22.17
• Overall length: 25.71

Product Details

Walker Products Engine Management and Oxygen/Air-Fuel sensors are developed as OE-style replacements for many vehicles worldwide. Part number 350-35048 is built for the upstream position and is intended to deliver the diagnostic feedback the ECU expects from the sensor circuit. The Walker Products Aftermarket line focuses on application-specific fitment, making this oxygen sensor a practical choice when replacing a failed front sensor on select Mazda 3, Mazda CX-5, Mazda 6, Mazda 2, Toyota Yaris, Toyota Yaris iA, and Scion iA models.

This part cross-references no listed aftermarket part numbers in the provided data.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Poor engine performance caused by incorrect air-fuel feedback
• Increased fuel consumption from a failing sensor signal
• Higher exhaust emissions from inaccurate ECU input
• Damaged sensor wiring or connector issues during replacement

Installation Notes

• Confirm the vehicle uses the upstream position before ordering.
• Inspect the sensor, wiring harness, and connector for physical damage before installation.
• Verify connector shape, wire count, and thread size against the original part.
• Use the vehicle’s service information for proper removal and torque procedures.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. Part number 350-35048 is manufactured for specific application fitment and OE-style diagnostic performance.

Compatible Vehicle Applications

• Fits 2018-2019 Mazda 2, Upstream
• Fits 2019 Toyota Yaris, Upstream
• Fits 2014-2018 Mazda 3, Upstream
• Fits 2016-2018 Mazda CX-3, Upstream
• Fits 2018 Mazda CX-5, Upstream
• Fits 2017-2018 Toyota Yaris iA, Upstream
• Fits 2014-2017 Mazda 6, Upstream
• Fits 2013-2017 Mazda CX-5, Upstream
• Fits 2016 Scion iA, Upstream
• Fits 2014-2015 Mazda 3 Sport, Upstream