Walker 350-35033 Oxygen Sensor - Upstream

Walker 350-35033 Oxygen Sensor for Mazda 3

Walker Products 350-35033 is a heated, threaded oxygen sensor built as a specific-fit OE replacement for select Mazda 3 and Mazda 3 Sport applications. It is engineered to deliver the correct feedback to the ECU, helping maintain proper fuel control and emissions performance.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed Mazda applications
• Threaded mounting type with 18.0 mm thread diameter
• 5-wire configuration with 20-gauge wiring
• Radiused polygon male connector for vehicle-specific connection
• Wiring harness length: 10.35; overall length: 13.9

Product Details

The Walker Products Aftermarket line focuses on OE-style engine management and emissions components for exact application fitment. Part number 350-35033 is made for upstream placement and is listed for 2010-2013 Mazda 3, upstream; 2010-2013 Mazda 3 Sport, upstream. This oxygen sensor is intended to restore accurate exhaust-gas feedback to the engine control system, which is critical for air-fuel management on modern vehicles. This part number, 350-35033, is a direct-fit option for drivers servicing a Mazda 3 or Mazda 3 Sport with an upstream sensor fault.

Common Issues This Sensor May Address

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

Installation Notes and Tips

Confirm the vehicle’s year, model, and upstream sensor position before ordering. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation, since damaged wiring can shorten service life. Verify thread size and connector style match the original part. Fits 2010-2013 Mazda 3, upstream. Fits 2010-2013 Mazda 3 Sport, upstream.

Quality Assurance

Walker Products has manufactured engine management and oxygen sensor components since 1946 and operates under Automotive ISO9001/TS 16949 certification. Part number 350-35033 is built for application-specific fitment and ECU feedback requirements.