Walker 350-34328 Oxygen Sensor - Downstream or Downstream Front

Walker 350-34328 Oxygen Sensor for Mazda 626

Walker Products 350-34328 is a heated oxygen sensor built as a specific-fit OE replacement for select Mazda 626 applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed Mazda 626 applications
• 4-wire configuration with a female radiused polygon connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 22.76 in.; overall length: 26.3 in.
• Walker Products Aftermarket part number 350-34328

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered as OE-style replacements for a wide range of vehicles. Part number 350-34328 is built for the specified downstream positions on Mazda 626 models, including 2000 California emissions and non-California applications, plus 2001-2002 downstream front coverage. For shoppers searching for a Mazda 626 downstream oxygen sensor or a Walker 350-34328 replacement, this sensor is matched to the listed fitment and connector style.

This sensor helps the ECU monitor exhaust oxygen content so the engine management system can adjust fueling and track emissions performance. If the original sensor is aging or damaged, the vehicle may run poorly, use more fuel, trigger a malfunction indicator light, or store fault codes related to the sensor circuit.

What It Helps Address

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

Installation Notes

Verify the connector shape, wire count, thread diameter, and sensor position before installation. Inspect the wiring harness and connector for heat damage, corrosion, or abrasion, since physical damage can shorten sensor life. Confirm the vehicle’s emissions configuration, especially for 2000 Mazda 626 applications, because California and non-California fitments differ. This part cross-references Walker Products Aftermarket 350-34328 for the same application.

Quality Assurance

Walker Products states that its engine management sensors are manufactured for specific applications and fitment positions, with diagnostic feedback intended to meet ECU requirements. The company is ISO 9001/TS 16949 certified and has supplied engine management and fuel system components since 1946.