Walker 350-33023 Oxygen Sensor - Upstream

Walker 350-33023 Oxygen Sensor for Mercedes-Benz

Walker Products 350-33023 is a heated, specific-fit oxygen sensor engineered as an OE-style replacement for select Mercedes-Benz applications. It is built for upstream placement and is designed to deliver the feedback the ECU uses to manage fuel control and emissions performance.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit for direct application matching
• Upstream sensor position for monitored exhaust feedback
• 3-wire design with female connector
• Threaded mounting with 18.0 mm thread diameter
• 27.28 in. wiring harness length and 30.83 in. overall length
• Radiused polygon connector shape for application-specific fitment

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for replacement use across many vehicles worldwide. Part number 350-33023 is manufactured for the specified application and fitment position, helping maintain the diagnostic input the ECU expects from the upstream sensor. This part is listed for Mercedes-Benz 300E, 300CE, 300TE, 300SE, 300SEL, 260E, and 560SL applications across 1986-1993 model years, including upstream service on the Mercedes-Benz 300E and Mercedes-Benz 300TE. If you are searching for a Walker 350-33023 oxygen sensor for Mercedes-Benz 300E upstream or a Walker 350-33023 replacement for Mercedes-Benz 300TE upstream, this part matches the listed vehicle coverage.

This part cross-references no listed interchange numbers in the provided data.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough running caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel control
• Higher exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the sensor circuit or related systems

Installation Notes and Tips

Confirm the vehicle year, model, and upstream sensor position before ordering. Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals before installation, since physical damage can shorten service life. Verify the threaded mounting point and connector style match the original configuration on the vehicle.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacement parts and manufactured under Automotive ISO9001/TS 16949 certification standards. The brand has supplied engine management and fuel system components since 1946, with application-specific fitment and ECU feedback requirements in mind.