Walker 350-34419 Oxygen Sensor - Downstream or Upstream

Walker Oxygen Sensor for Mercedes-Benz S320

Walker Products 350-34419 is a specific-fit heated oxygen sensor engineered as an OE-style replacement for select Mercedes-Benz S320 applications. It is built for upstream and downstream positions where listed, helping the ECU receive the exhaust feedback it needs for proper fuel control and emissions monitoring.

Compatible With 1995-1996 Mercedes-Benz S320 upstream and 1996 Mercedes-Benz S320 downstream applications, this sensor is designed around the vehicle’s original mounting and connector requirements. The Walker Products Aftermarket line focuses on application-specific engine management components, and 350-34419 follows that approach for direct-fit service work.

Key Features

• Part number: 350-34419
• Heated oxygen sensor design
• Specific fit for listed Mercedes-Benz S320 applications
• Threaded mounting type with 18.0 mm thread diameter
• 4-wire configuration with 20-gauge wiring
• 14.29 wiring harness length and 17.83 overall length
• Male connector with radiused polygon shape

Detailed Description

Walker Products 350-34419 is an emission control sensor built to replace the original oxygen sensor on select Mercedes-Benz S320 models. The heated design helps the sensor reach operating temperature quickly so the ECU can monitor exhaust oxygen content and adjust air-fuel strategy. For 1995-1996 Mercedes-Benz S320 upstream service and 1996 Mercedes-Benz S320 downstream service, this part number is matched to the listed position and vehicle-specific fitment.

Walker Products Aftermarket has supplied engine management components since 1946, with a focus on OE replacement fitment and application-specific feedback to the vehicle’s control system. If your Mercedes-Benz S320 has a stored fault code, poor fuel economy, elevated emissions, or an illuminated MIL, the oxygen sensor circuit is one of the first areas to inspect along with the wiring harness and connector.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel mixture concerns
• Reduced fuel economy
• Higher exhaust emissions
• Poor engine operation tied to exhaust feedback faults

Installation Notes and Tips

Verify the sensor position before ordering: this part is listed for 1995-1996 Mercedes-Benz S320 upstream and 1996 Mercedes-Benz S320 downstream applications. Inspect the connector, harness, and surrounding wiring for damage before installation, since physical wear can shorten sensor life and affect readings. Confirm thread size, connector style, and harness routing against the original part to ensure proper installation.

Quality Assurance

Walker Products manufactures engine management and oxygen/air-fuel sensors as OE replacement components for specific applications. The brand is ISO 9001/TS 16949 certified and has supported automotive sensor and fuel system needs since 1946. Part number 350-34419 is built to provide the diagnostic feedback expected by the ECU in the listed Mercedes-Benz S320 applications.