Walker 350-34185 Oxygen Sensor - Downstream Front, Downstream Rear or Upstream

Walker 350-34185 Oxygen Sensor Overview

Walker Products 350-34185 is a specific-fit heated oxygen sensor engineered as an OE-style replacement for select Chevrolet, Ford, and Mazda applications. It is built for the correct mounting position and ECU feedback requirements, helping restore accurate exhaust monitoring on vehicles such as the Chevrolet Spark, Chevrolet Beat, Ford Probe, Mazda 626, and Mazda MX-6.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• Specific-fit design for the listed application and mounting position
• 4-wire configuration with a 20-gauge harness
• Radiused polygon male connector for proper vehicle-side connection
• Threaded mount with 18.0 mm thread diameter
• Overall length: 23.94 in.; wiring harness length: 20.39 in.
• Walker Products Aftermarket line for engine management and oxygen/air-fuel sensor replacement

Product Details

Walker Products 350-34185 is part of the Walker Products Aftermarket line, which focuses on engine management and oxygen/air-fuel sensors built for direct replacement use. This sensor is manufactured for the specified fitment position so the ECU receives the correct diagnostic feedback. For vehicles like the 2011-2012 Chevrolet Spark upstream application or the 2018-2021 Chevrolet Beat upstream application, accurate sensor response is important for fuel control and emissions monitoring. The same part number also appears in downstream front and downstream rear positions for select Ford Probe, Mazda 626, and Mazda MX-6 applications.

This part cross-references common OE-style replacement needs for the same application; verify connector shape, thread size, and sensor position before ordering. Walker Products 350-34185 is a practical choice when replacing a worn upstream or downstream oxygen sensor on the listed vehicles.

What This Oxygen Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from incorrect air-fuel readings
• Elevated exhaust emissions from a degraded sensor signal
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

• Confirm the exact position before installation: upstream, downstream front, or downstream rear.
• Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion.
• Verify the 18.0 mm thread diameter and threaded mounting style match the vehicle.
• Use the connector shape and wire count to confirm the replacement matches the original unit.
• Clear stored fault codes after installation and verify proper ECU feedback during a road test.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacement parts and manufactured under Automotive ISO9001/TS 16949 quality systems. Since 1946, the brand has supplied oxygen and air-fuel sensors for vehicle service applications worldwide.

• Fits 2018-2021 Chevrolet Beat, upstream
• Fits 2011-2012 Chevrolet Spark, upstream
• Fits 1997 Ford Probe, downstream front
• Fits 1996 Ford Probe, downstream rear
• Fits 1996 Mazda 626, downstream rear
• Fits 1996 Mazda MX-6, downstream rear