Walker 350-34681 Oxygen Sensor - Downstream

OE Replacement Downstream Oxygen Sensor

Walker OE Replacement oxygen sensor Part Number 350-34681 is a direct-fit downstream sensor for select Mercedes-Benz applications. It uses a heated narrow-band design with a 4-wire, pin-terminal configuration to deliver the ECU feedback expected for emissions and fuel-control monitoring.

Key Features

• Heated narrow-band oxygen sensor for downstream placement
• Specific-fit design for the listed Mercedes-Benz applications
• 4-wire construction with female connector and male terminals
• Threaded M18 x 1.5 mounting with 22 mm wrench size
• Oblong connector shape and 565 mm wiring harness length
• Overall length: 590 mm

Product Details

Walker Products OE Replacement sensors are engineered as direct replacements for original equipment applications, with fitment matched to the vehicle position and diagnostic requirements. This downstream oxygen sensor is built for Mercedes-Benz models that rely on accurate exhaust feedback to help the ECU monitor catalyst and emissions performance. The Walker 350-34681 is a practical choice for drivers servicing a Mercedes-Benz C300 downstream oxygen sensor, a Mercedes-Benz GLE450 downstream oxygen sensor, or a Mercedes-Benz AMG GT 43 downstream oxygen sensor application.

Compatible With select 2019-2025 Mercedes-Benz models including C300, CLA250, E450, GLC300, GLE350, GLS450, A220, GLB250, GLA250, AMG GT 43, AMG GT 53, C43 AMG, and related downstream applications. The Walker OE Replacement line focuses on application-specific fitment and diagnostic feedback, making Part Number 350-34681 a straightforward replacement for the listed vehicles.

What It Helps Address

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

Installation Notes and Tips

Confirm the connector shape, wire count, thread size, and downstream position before installation. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear, since damaged wiring can shorten service life and trigger fault codes. Verify the vehicle’s exact model and year against the fitment list before ordering.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and manufactures OE-style replacement sensors for specific vehicle applications. The brand operates with ISO 9001/TS 16949 quality systems and builds this sensor to meet the diagnostic needs of the listed Mercedes-Benz fitments. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.