Walker 350-34036 Oxygen Sensor - Downstream, Upstream or Upstream Front

Walker 350-34036 Oxygen Sensor Overview

Walker Products 350-34036 is a heated oxygen sensor built as a specific-fit OE replacement for select Mazda applications. It is engineered to provide the ECU with the exhaust feedback needed for fuel control and emissions monitoring, making it a direct replacement choice for Mazda MPV, Protege, and MX-3 models listed below.

Key Features

• Heated oxygen sensor for faster operating temperature and signal response
• Specific-fit design for the listed Mazda applications
• 4-wire configuration with 20-gauge wiring
• Female connector with radiused polygon shape
• Threaded mounting type with 18.0 mm thread diameter
• Overall length: 10.94 in.; wiring harness length: 7.4 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered for OE-style replacement use. Part number 350-34036 is built for the correct application, fitment position, and ECU feedback requirements. For Mazda MPV, Mazda Protege, and Mazda MX-3 vehicles, this sensor is specified for upstream or downstream placement depending on the model and emissions configuration. If the original sensor has failed, the vehicle may show poor running quality, higher fuel use, increased exhaust emissions, or a malfunction indicator light.

This part number, 350-34036, is listed for 2000-2001 Mazda MPV downstream applications without California emissions certification, 1999-2000 Mazda Protege upstream applications, and 1992-1995 Mazda MX-3 upstream front applications.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel mixture concerns
• Reduced fuel economy from inaccurate exhaust feedback
• Elevated exhaust emissions
• Poor engine operation caused by a worn sensor

Installation Notes

Confirm the sensor position before installation: upstream, downstream, or upstream front, depending on the vehicle. Inspect the wiring harness and connector for heat damage, corrosion, or physical wear before replacing the sensor. Verify thread size and connector style match the original unit, and clear diagnostic trouble codes after installation if required by the repair procedure.

Quality Assurance

Walker Products has produced engine management components since 1946 and operates as an Automotive ISO 9001/TS 16949 certified company. The 350-34036 oxygen sensor is manufactured for application-specific fitment and ECU feedback requirements. This part cross-references standard aftermarket listings for the same application.