Walker 350-64019 Oxygen Sensor - Upstream

Walker 350-64019 Oxygen Sensor for Mazda 3

Walker Products 350-64019 is a heated oxygen sensor built as a specific-fit replacement for select 2004-2009 Mazda 3 applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring, especially on California-ESV and California emissions vehicles.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fitment for select Mazda 3 upstream applications
• Threaded mounting type with 18.0 mm thread diameter
• 4-wire design with female radiused polygon connector
• Wiring harness length: 15.67 in.; overall length: 19.21 in.
• Wire gauge: 20

Product Details

Walker Products Aftermarket 350-64019 is an OE-style engine management sensor for the upstream position on select Mazda 3 models. It is designed for vehicles that rely on accurate exhaust-gas feedback to help the ECU manage air-fuel ratio, emissions performance, and diagnostic monitoring. Walker Products develops these oxygen and air-fuel sensors as application-specific replacements, with fitment and connector design matched to the vehicle platform.

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors for direct replacement use. For shoppers searching for a Mazda 3 upstream oxygen sensor, Mazda 3 California emissions oxygen sensor, or Walker 350-64019, this part number is listed for the 2004-2009 Mazda 3 in upstream position applications.

This part cross-references no listed alternate part numbers for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by incorrect exhaust feedback
• Rough engine operation from inaccurate air-fuel control
• Elevated exhaust emissions
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes

Fits 2004-2009 Mazda 3, upstream. Confirm California-ESV or California emissions application before ordering. Inspect the sensor wiring harness and connector for damage before installation, since physical wear can shorten sensor life. Verify connector shape, thread diameter, and harness length against the original part to ensure proper routing and fit.

Quality Assurance

Walker Products states that its engine management sensors are developed as OEM replacement parts and manufactured under ISO 9001/TS 16949 quality systems. Since 1946, the brand has supplied engine management and fuel system components for vehicle applications worldwide.