Walker 350-34239 Oxygen Sensor - Upstream Right

Walker 350-34239 Oxygen Sensor Overview

Walker Products 350-34239 is a heated oxygen sensor built as a direct-fit OE-style replacement for specific Mercedes-Benz applications. It is engineered for the upstream right position and provides the ECU with the feedback needed for accurate fuel control and emissions monitoring.

Compatible With 1998-2000 Mercedes-Benz C280, 1998-2000 Mercedes-Benz C43 AMG, 1998-2000 Mercedes-Benz CLK320, and 1999-2000 Mercedes-Benz CLK430 in the upstream right location.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• Specific-fit design for the correct application and mounting position
• 4-wire configuration with a 20-gauge harness
• Threaded mount with 18.0 mm thread diameter
• Radiused polygon male connector for vehicle-specific connection
• Wiring harness length: 25.12 in.; overall length: 28.66 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered for OE replacement use. Part number 350-34239 is built for the upstream right sensor location on select Mercedes-Benz models, including C280, C43 AMG, CLK320, and CLK430. As a heated sensor, it helps the engine control module monitor exhaust oxygen content and adjust air-fuel strategy for proper drivability and emissions performance. If the original sensor is aging or damaged, the ECU may log fault codes and the vehicle may show poor running behavior or increased fuel use.

This part number, 350-34239, is a direct-fit replacement for the specified Mercedes-Benz applications and is intended to match the original sensor position and connector style. Walker Products has supplied engine management components since 1946 and manufactures to automotive ISO 9001/TS 16949 standards.

Common Issues This Sensor May Address

• Check engine light or malfunction indicator light related to oxygen sensor performance
• Stored ECU fault codes tied to the upstream right sensor circuit
• Rough engine operation caused by incorrect air-fuel feedback
• Higher fuel consumption from inaccurate exhaust oxygen readings
• Increased exhaust emissions from a degraded sensor signal

Installation Notes

Verify the upstream right position before installation and confirm connector shape, thread diameter, and harness length against the original part. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten service life and affect signal quality. For best results, clear any stored fault codes after installation and confirm proper ECU feedback during a road test.

Quality Assurance

Walker Products manufactures this oxygen sensor as an OE replacement part for the listed applications and builds it under automotive ISO 9001/TS 16949 quality systems. Part number 350-34239 is engineered for specific fitment and diagnostic feedback requirements on the covered Mercedes-Benz models.