Walker 350-34056 Oxygen Sensor - Downstream

Walker 350-34056 Oxygen Sensor Overview

Walker 350-34056 is a heated oxygen sensor built as a specific-fit replacement for the downstream application on select Mazda RX-8 models. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring.

For 2009-2011 Mazda RX-8 vehicles, this sensor is listed for the downstream bank 1 sensor 2 position. If the check engine light is on, fuel economy has dropped, or exhaust readings are out of range, the oxygen sensor circuit is one of the first areas to inspect.

Key Features

• Specific-fit oxygen sensor for the listed Mazda RX-8 application
• Heated sensor design for faster operating temperature
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector for vehicle-specific connection
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 8.39 in.; overall length: 11.93 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed as OE-style replacements for global vehicle applications. Part number 350-34056 is built for the correct fitment position and diagnostic feedback expected by the ECU, helping maintain accurate air-fuel monitoring on the Mazda RX-8. Walker Products has supplied engine management and fuel system components since 1946, and its ISO 9001/TS 16949 manufacturing background supports consistent application-specific production.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

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

Installation Notes and Tips

Verify the downstream bank 1 sensor 2 location before installation on 2009-2011 Mazda RX-8 models. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten sensor life and affect signal quality. Confirm the threaded mounting point and connector style match the original part before final tightening.

Quality Assurance

Walker Products manufactures this oxygen sensor as a specific application replacement for the listed vehicle fitment. The brand’s ISO 9001/TS 16949 manufacturing standards and long-running engine management focus support consistent fitment and diagnostic performance.