Walker 350-34244 Oxygen Sensor - Downstream or Upstream Front

Walker 350-34244 Oxygen Sensor for Mazda 626

Walker Products 350-34244 is a heated oxygen sensor built as a specific-fit OE-style replacement for select Mazda 626 applications. It is engineered for the correct mounting position and ECU feedback needed to support accurate air-fuel control on 1998-2000 Mazda 626 models.

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors developed for direct replacement use. For this part, the application-specific design, 4-wire heated construction, threaded mounting, and female radiused-polygon connector help match the original sensor layout on the vehicle.

Key Features

• Part number: 350-34244
• Heated oxygen sensor for emissions and engine management systems
• Specific fit for select Mazda 626 upstream front and downstream positions
• 4-wire design with 20-gauge wiring
• 17.24 in. wiring harness length and 20.79 in. overall length
• 18.0 mm thread diameter with threaded mounting type
• Female connector with radiused polygon shape

Detailed Description

Walker Products 350-34244 is an oxygen sensor for Mazda 626 models that require a direct-fit replacement in the upstream front or downstream location, depending on the vehicle and emissions package. It is listed for 2000 Mazda 626 non-California emissions upstream front applications, 1998-1999 Mazda 626 upstream front applications, and 1998-1999 Mazda 626 downstream California emissions positions, including B1S2 and bank 1 sensor 2 references. If you are searching for a 1998-2000 Mazda 626 oxygen sensor, this part number provides a fitment-specific option for the listed positions.

As an OE-replacement sensor, it is intended to provide the diagnostic feedback the ECU expects from the affected exhaust location. This makes it a practical choice when replacing a failed Mazda 626 upstream oxygen sensor or a downstream sensor on California-emissions vehicles. The Walker Products 350-34244 part number should be matched to the exact year, emissions setup, and sensor position before ordering.

What It 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 readings
• Higher exhaust emissions from a failing sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Confirm the vehicle year, emissions configuration, and sensor position before installation. For Mazda 626 upstream front and downstream applications, inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacing the part. Verify the threaded mounting location and connector style match the original sensor on the vehicle. This part is a direct replacement for the listed applications, so correct fitment depends on matching the exact position and emissions specification.

Quality Assurance

Walker Products has manufactured engine management and oxygen sensor components since 1946 and operates as an ISO 9001/TS 16949 certified company. The Walker Products Aftermarket line is built around application-specific replacement parts for vehicles such as the Mazda 626, with attention to fitment position and ECU feedback requirements.