Walker 350-33029 Oxygen Sensor - Upstream Front or Upstream Rear

Walker 350-33029 Oxygen Sensor for Mazda

Walker Products 350-33029 is a heated oxygen sensor built as a specific-fit OE replacement for select 1994-1995 Mazda 626 and Mazda MX-6 applications. It is engineered to provide the ECU with the feedback needed for accurate fuel control and emissions monitoring.

For drivers searching for a 1994-1995 Mazda 626 upstream oxygen sensor or a 1994-1995 Mazda MX-6 upstream oxygen sensor, this Walker Products Aftermarket part number 350-33029 is matched to the listed position and connector style.

Key Features

• Heated oxygen sensor for emissions and fuel-management feedback
• Specific-fit design for the listed Mazda applications
• Threaded mounting type with 18.0 mm thread diameter
• 3-wire configuration with 20-gauge wiring
• Radiused polygon male connector for application-specific fitment
• Wiring harness length: 11.34 in.; overall length: 14.88 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered as OE-style replacements. Part number 350-33029 is built for the correct application and sensor position so the vehicle’s ECU receives the expected diagnostic feedback. This matters on newer electronic engine management systems, where a failing sensor can trigger fault codes, rough running, higher fuel use, increased exhaust emissions, or an illuminated malfunction indicator light. For Mazda 626 and Mazda MX-6 owners, the correct upstream rear or upstream front oxygen sensor position is critical to proper operation.

This part cross-references no listed interchange numbers in the provided data.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel mixture concerns
• Reduced fuel economy from inaccurate exhaust feedback
• Elevated exhaust emissions
• Rough engine operation tied to sensor signal issues

Installation Notes and Tips

Verify the vehicle’s exact position before ordering: Fits 1994-1995 Mazda 626, Upstream Rear; Fits 1994-1995 Mazda 626, Upstream Front; Fits 1994-1995 Mazda MX-6, Upstream Rear; Fits 1994-1995 Mazda MX-6, Upstream Front. Inspect the sensor, wiring harness, and connector for physical damage before installation, since damaged components can shorten service life and affect readings. Confirm thread size, connector shape, and harness length against the original part before replacement.

Quality Assurance

Walker Products states that its engine management sensors are developed under Automotive ISO9001/TS 16949-certified manufacturing practices. Since 1946, the brand has supplied engine management and fuel system components for a wide range of vehicle applications.