Walker 350-33018 Oxygen Sensor - Upstream

Walker 350-33018 Oxygen Sensor for Mercedes-Benz

Walker Products 350-33018 is a heated, threaded oxygen sensor built as a specific-fit OE replacement for select Mercedes-Benz applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring, making it a direct choice for upstream sensor service on covered vehicles.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed Mercedes-Benz applications
• Threaded mounting with 18.0 mm thread diameter
• Female connector with radiused polygon shape
• 3-wire configuration with 20-gauge wiring
• Wiring harness length: 35.94 in.; overall length: 39.49 in.
• Walker Products Aftermarket engine management sensor line

Product Line Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for application-specific fitment and ECU feedback requirements. The 350-33018 follows that approach with a vehicle-matched connector, harness length, and mounting style for the listed upstream Mercedes-Benz positions.

Detailed Description

This Walker oxygen sensor is intended for upstream placement on select 1982-1991 Mercedes-Benz models, including the 1982-1983 Mercedes-Benz 380SEC and the 1986-1991 Mercedes-Benz 420SEL, 560SEC, and 560SEL. The part number 350-33018 is designed to replace the original sensor in the correct location so the engine control unit can monitor exhaust oxygen content and adjust fueling as needed. If the sensor is aging or damaged, the vehicle may show poor running behavior, higher fuel use, increased emissions, or a malfunction indicator light. The part number 350-33018 is a practical OE-style service part for Mercedes-Benz 420SEL upstream oxygen sensor replacement and related applications.

What It Helps Address

• Check engine or malfunction indicator light related to oxygen sensor performance
• Rough idle or inconsistent engine operation
• Increased fuel consumption from inaccurate exhaust feedback
• Elevated exhaust emissions
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Confirm the upstream position before installation and compare the connector, thread diameter, and harness length to the original sensor. Inspect the wiring harness and connector for heat damage, corrosion, or physical wear before replacement. For Mercedes-Benz 560SEC oxygen sensor and 560SEL oxygen sensor service, verify the sensor location and connector routing to ensure proper fitment. This part cross-references Bosch 13913 for the same application.

Quality Assurance

Walker Products has produced engine management components since 1946 and operates as an ISO 9001/TS 16949 certified company. The 350-33018 is manufactured for the specified application and position to support the diagnostic feedback expected by the ECU.