Walker 350-34723 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Walker 350-34723 Oxygen Sensor for Mercedes-Benz

Walker Products 350-34723 is a heated oxygen sensor built as a specific-fit OE replacement for select Mercedes-Benz and INFINITI applications. It is engineered for downstream placement and provides the ECU with the feedback needed to monitor exhaust performance and emissions control.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for the listed vehicle applications
• 4-wire configuration with female connector
• 18.00 mm thread diameter
• Wiring harness length: 10.35 in.; overall length: 13.9 in.
• Walker Products Aftermarket engine management sensor line

Product Details

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors engineered as OE-style replacements for worldwide vehicle coverage. Part number 350-34723 is designed for the correct fitment position and diagnostic response required by the ECU on supported vehicles, including Mercedes-Benz CLA250, GLA250, Metris, S600, and Maybach S650 applications. It is also listed for select INFINITI QX30 downstream coverage.

This part cross-references Bosch 17098 and Denso 234-9005 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Poor fuel economy caused by inaccurate exhaust feedback
• Elevated exhaust emissions from a failing sensor
• Rough engine operation tied to sensor signal issues
• Stored ECU fault codes for the affected sensor circuit

Installation Notes

• Confirm the exact position before ordering: downstream right, downstream left, or downstream.
• Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals.
• Verify thread size and connector style against the original part before installation.
• Use the vehicle’s fault codes and service information to confirm the affected bank and sensor location.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an ISO 9001 / TS 16949 certified manufacturer. Part number 350-34723 is built for the specified application and fitment position to support proper ECU feedback on compatible Mercedes-Benz and INFINITI models.