Walker 350-35078 Oxygen Sensor

Walker 350-35078 Oxygen Sensor for BMW and Mercedes-Benz

Walker Products 350-35078 is a heated oxygen sensor built as a specific-fit OE replacement for select BMW and Mercedes-Benz applications. It is engineered to deliver the ECU feedback needed for accurate air-fuel control, emissions monitoring, and fault-code diagnosis.

For drivers searching for an upstream oxygen sensor for BMW Z4, BMW 335i, or Mercedes-Benz C250 applications, this Walker Products Aftermarket sensor is matched to the listed position and connector style for direct replacement service.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed vehicle applications
• Threaded mounting type with 18.0 mm thread diameter
• 5-wire configuration with 20-gauge wiring
• Radiused polygon connector shape, male connector
• Wiring harness length: 57.6
• Overall length: 61.14
• Walker Products Aftermarket part number 350-35078

Product Details

Walker Products Engine Management and Oxygen/Air-Fuel sensors are developed as OE-style replacements for worldwide vehicle coverage. Part number 350-35078 is built for the specified application, fitment position, and ECU feedback requirements. Walker Products has supplied engine management and fuel system components since 1946 and operates with ISO 9001/TS 16949 quality systems.

This sensor is listed for upstream positions on select BMW and Mercedes-Benz models, including BMW Z4, BMW 335i, BMW 328i, BMW 530i, and Mercedes-Benz C250, SLK250, C200, C180, and C63 AMG applications. If your vehicle has a check engine light, poor fuel economy, or elevated emissions, a failing upstream oxygen sensor can be one of the causes.

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 or poor engine response from incorrect air-fuel feedback
• Increased fuel consumption caused by inaccurate sensor readings
• Higher exhaust emissions from improper mixture control
• Fault codes stored in the ECU for upstream sensor circuits

Installation Notes and Tips

• Verify the vehicle position before ordering: upstream front, upstream left, or upstream right as listed.
• Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation.
• Confirm thread diameter and connector shape match the original sensor.
• Use the vehicle’s fault codes and service information to confirm Bank 1 Sensor 1 or the specified upstream location.

Quality Assurance

Walker Products manufactures engine management sensors to application-specific standards and supports its aftermarket line with ISO 9001/TS 16949 quality processes. Part number 350-35078 is built for the listed OE-style replacement use on the confirmed BMW and Mercedes-Benz applications.