Walker 350-34153 Oxygen Sensor - Downstream Rear

Walker 350-34153 Oxygen Sensor for Mazda Millenia

Walker Products 350-34153 is a heated oxygen sensor built as a specific-fit OE-style replacement for the downstream rear position on select Mazda Millenia models. It is engineered to deliver the diagnostic feedback the ECU expects, helping restore accurate exhaust monitoring on 1997-2000 Mazda Millenia applications.

Key Features

• Specific-fit oxygen sensor for the downstream rear location
• Heated sensor design for faster operating temperature
• 4-wire configuration with male connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 37.52 in.
• Overall length: 41.06 in.
• Walker Products Aftermarket line for engine management and oxygen/air-fuel sensor replacement

Product Details

Walker Products 350-34153 is designed for 1997-2000 Mazda Millenia, downstream rear. The sensor uses a radiused polygon connector shape, 20-gauge wiring, and a threaded mount to match the specified application. As part of the Walker Products Aftermarket line, this oxygen sensor is built for vehicle-specific fitment and ECU feedback requirements, making it a direct replacement choice for the Mazda Millenia rear downstream oxygen sensor location. This part number, 350-34153, is intended for the exact position listed and should be installed in the correct downstream rear location on the vehicle.

Walker Products has supplied engine management and oxygen/air-fuel sensors since 1946, with manufacturing aligned to automotive ISO 9001/TS 16949 quality systems. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from a failing downstream sensor
• Higher exhaust emissions from incorrect air-fuel monitoring
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes

Confirm the sensor is installed in the downstream rear position on the Mazda Millenia before replacement. Inspect the sensor wiring harness and connector for damage, since physical wear can shorten sensor life and affect signal quality. Verify thread size, connector style, and harness routing against the original part before installation. The part number 350-34153 is specific to the listed application and position.

Quality Assurance

Walker Products manufactures engine management sensors under ISO 9001/TS 16949 quality certification and develops application-specific replacements for ECU-driven vehicles. The 350-34153 oxygen sensor is built to match the listed fitment and diagnostic requirements for 1997-2000 Mazda Millenia, downstream rear.