Walker 350-34573 Oxygen Sensor - Upstream Front

Walker Oxygen Sensor for Mazda 6

Walker Products Part Number 350-34573 is a specific-fit heated oxygen sensor for the upstream front position on select 2003-2008 Mazda 6 models. It is built to deliver the ECU feedback needed for proper fuel control and emissions monitoring.

Key Features

• Specific-fit oxygen sensor for the upstream front location
• Heated sensor design for faster operating response
• 4-wire configuration with a male radiused polygon connector
• 18.0 mm thread diameter and threaded mounting type
• 45.98 in. wiring harness length and 49.53 in. overall length
• Walker Products Aftermarket engine management sensor line

Product Details

Walker Products 350-34573 is engineered as an OE-style replacement oxygen sensor for the exhaust stream ahead of the catalytic converter on the Mazda 6. For 2003-2008 Mazda 6 upstream front oxygen sensor replacement, this part is designed to restore accurate air-fuel feedback to the engine control unit. Walker Products Aftermarket focuses on application-specific fitment, so the sensor, connector style, and mounting details match the intended vehicle position.

Walker Products has supplied engine management and oxygen/air-fuel sensors for decades, with manufacturing aligned to automotive ISO 9001/TS 16949 quality systems. The 350-34573 part number is intended for the exact fitment position listed, making it a practical choice when diagnosing sensor-related fault codes, poor fuel economy, elevated emissions, or a malfunction indicator light on Mazda 6 models.

What This Sensor Helps Address

• Check engine light related to the upstream oxygen sensor circuit
• Incorrect air-fuel ratio feedback to the ECU
• Poor engine performance caused by a failing sensor
• Increased fuel consumption from inaccurate exhaust readings
• Higher exhaust emissions from delayed or faulty sensor response

Installation Notes

Fits 2003-2008 Mazda 6, upstream front. Confirm the connector shape, wire count, thread diameter, and harness length 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. This part number is 350-34573.

Quality Assurance

Walker Products manufactures this oxygen sensor as a specific application replacement and backs its engine management product line with ISO 9001/TS 16949 manufacturing practices. This part cross-references Walker Products Aftermarket 350-34573 for the same application.