Walker 350-35037 Oxygen Sensor - Downstream or Upstream

Walker Oxygen Sensor for Mercedes-Benz Applications

Walker Products 350-35037 is a heated oxygen sensor built as a specific-fit OE replacement for select Mercedes-Benz vehicles. It is engineered to deliver the ECU feedback needed for proper fuel control and emissions monitoring on supported upstream and downstream applications.

For Mercedes-Benz Sprinter 2500, Sprinter 3500, Sprinter 3500XD, A200, and E350 coverage, this sensor is matched to the listed position and connector style for direct replacement service. Walker Products Aftermarket focuses on application-specific engine management sensors, and part number 350-35037 follows that approach for precise fitment.

Key Features

• Heated oxygen sensor for emissions and fuel-trim monitoring
• Specific-fit design for listed Mercedes-Benz applications
• Threaded mounting type with 18.0 mm thread diameter
• 5-wire configuration with 20-gauge wiring
• Radiused polygon male connector for vehicle-specific connection
• Wiring harness length: 19.21 in.; overall length: 22.76 in.

Detailed Description

Walker Products 350-35037 is an OE-style oxygen sensor designed for the exact application and mounting position shown in the fitment data. It supports the ECU with the diagnostic signal needed to manage air-fuel ratio, emissions performance, and fault detection on compatible Mercedes-Benz models. The heated sensor design helps the unit reach operating temperature quickly for more consistent feedback during engine operation.

This part is listed for 2018-2022 Mercedes-Benz Sprinter 2500, upstream; 2018-2022 Mercedes-Benz Sprinter 3500, upstream; 2018-2022 Mercedes-Benz Sprinter 3500XD, upstream; 2018 Mercedes-Benz A200, downstream; 2013 Mercedes-Benz A200, downstream; 2011-2013 Mercedes-Benz E350, upstream; 2013 Mercedes-Benz Sprinter 2500, upstream; 2013 Mercedes-Benz Sprinter 3500, upstream; 2010-2012 Mercedes-Benz Sprinter 2500, downstream; and 2010-2012 Mercedes-Benz Sprinter 3500, downstream. This part number, 350-35037, is built for those specific positions rather than universal use.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by incorrect air-fuel feedback
• Rough engine operation from inaccurate sensor readings
• Elevated exhaust emissions from a failing upstream or downstream sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Confirm the vehicle year, model, and sensor position before ordering. For best results, inspect the wiring harness and connector for heat damage, corrosion, or physical wear before installation. Because this is a threaded, vehicle-specific sensor, proper routing and connector alignment are important for reliable operation.

Use the fitment list to verify whether your Mercedes-Benz Sprinter 2500, Sprinter 3500, Sprinter 3500XD, A200, or E350 requires an upstream or downstream sensor. Walker Products 350-35037 should be matched to the exact listed application for correct ECU feedback.

Quality Assurance

Walker Products Aftermarket develops engine management and oxygen/air-fuel sensors as OE replacement parts for global vehicle applications. The brand operates as an ISO 9001/TS 16949 certified company and has supplied engine management components since 1946.