Walker 350-35045 Oxygen Sensor - Upstream

Walker 350-35045 Oxygen Sensor Overview

Walker Products 350-35045 is a heated, specific-fit oxygen sensor engineered as an OE-style replacement for select Mazda applications. It is built for upstream placement and provides the ECU with the feedback needed to monitor air-fuel control on the affected engine management system.

Fits 2006-2007 Mazda 6, upstream. Fits 2007-2012 Mazda CX-7, upstream. This Walker Products Aftermarket sensor is a direct-fit option for drivers diagnosing a check engine light, fuel trim concerns, or emissions-related fault codes on these Mazda models.

Key Features

• Part number: 350-35045
• Heated oxygen sensor for faster operating response
• Specific fit for the listed Mazda applications
• Upstream mounting position
• 5-wire design with 20-gauge wiring
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon male connector
• Wiring harness length: 29.06 in.; overall length: 32.6 in.

Application Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for application-specific fitment and ECU feedback requirements. For the Mazda 6 and Mazda CX-7, this upstream sensor is intended for Bank 1 Sensor 1 service where the original sensor has failed or is no longer reporting accurately. The part number 350-35045 is listed for 2006-2007 Mazda 6 upstream and 2007-2012 Mazda CX-7 upstream configurations.

What This Sensor Can Help Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate sensor readings
• Elevated exhaust emissions from a faulty upstream sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes

Verify the connector shape, wire count, thread diameter, and upstream position before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten service life and affect signal quality. Confirm the vehicle is the correct Mazda 6 or Mazda CX-7 application before replacing the sensor.

Quality Assurance

Walker Products has produced engine management components since 1946 and operates as an Automotive ISO 9001/TS 16949 certified company. The 350-35045 oxygen sensor is manufactured for specific vehicle applications to support the diagnostic feedback expected by the ECU.