Walker 350-34507 Oxygen Sensor - Downstream

Walker 350-34507 Oxygen Sensor Overview

Walker Products 350-34507 is a heated oxygen sensor built as a specific-fit OE replacement for select vehicles. It is engineered for downstream monitoring on 2007-2013 Mazda 3 applications, helping the ECU receive the feedback it expects from the exhaust system.

For Mazda 3 owners diagnosing a check engine light or drivability concern, this Walker Products Aftermarket sensor is built around the application details that matter: threaded mounting, a 4-wire heated design, and the correct connector style for the listed position. The Walker 350-34507 is a direct-fit oxygen sensor for downstream bank 1 sensor 2 use on specific Mazda 3 models.

Key Features

• Specific-fit oxygen sensor for listed Mazda 3 applications
• Heated sensor design for faster operating response
• Downstream position for bank 1 sensor 2 service
• 4-wire configuration with female connector
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 12.32
• Overall length: 15.87
• Walker Products part number 350-34507

Application Details

Compatible with 2007-2013 Mazda 3, downstream. This fitment is listed for downstream bank 1 sensor 2 on specific vehicle models, making it a focused replacement for exhaust feedback service on the Mazda 3 platform. The Walker 350-34507 is part of Walker Products Aftermarket engine management and oxygen/air-fuel sensor line, which is built around application-specific fitment and ECU feedback requirements.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel monitoring
• Higher exhaust emissions from a failing downstream sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes

Confirm the vehicle is a 2007-2013 Mazda 3 with the downstream bank 1 sensor 2 location before ordering. Inspect the sensor, wiring harness, and connector for physical damage during diagnosis, since damage in these areas can shorten service life and affect operation. Verify the threaded mounting style, connector shape, and wire count match the original part before installation.

Quality Assurance

Walker Products has supplied engine management components since 1946 and manufactures sensors to application-specific requirements for OE-style replacement service. The brand operates under Automotive ISO9001/TS 16949 certification, with a focus on consistent fitment and diagnostic feedback for modern ECU-controlled vehicles. Part number 350-34507 is built for the listed application and position.