Facet 7.3139 Engine Coolant Temperature Sensor

Engine Coolant Temperature Sensor for Mercedes-Benz

Facet 7.3139 is an engine coolant temperature sensor for select Mercedes-Benz diesel applications. It is a direct-fit replacement for vehicles that rely on accurate coolant temperature input for engine management and gauge operation.

Key Features

• Engine coolant temperature sensor for Mercedes-Benz diesel models
• Fits 1994-1995 Mercedes-Benz S350, N/A
• Fits 1990-1993 Mercedes-Benz 300D, N/A
• Fits 1992-1993 Mercedes-Benz 300SD, N/A
• Fits 1991 Mercedes-Benz 350SD, N/A
• Fits 1990-1991 Mercedes-Benz 350SDL, N/A
• Facet part number 7.3139

Detailed Description

Facet 7.3139 is built for Mercedes-Benz diesel platforms that require a reliable coolant temperature signal. This sensor supports accurate temperature reporting to the vehicle’s control system and instrumentation, helping maintain proper engine monitoring on 1990-1995 Mercedes-Benz 300D, 300SD, 350SD, 350SDL, and S350 applications. If you are replacing a failing Mercedes-Benz coolant temp sensor, 7.3139 provides a focused OE-style service part for the listed fitments.

What It Helps Address

• Erratic or inaccurate coolant temperature readings
• Temperature gauge behavior that does not match engine conditions
• Faults related to coolant temperature signal loss
• Hard starting or drivability concerns tied to incorrect temperature input
• Maintenance replacement on aging Mercedes-Benz diesel cooling systems

Installation Notes and Tips

Verify connector style, thread size, and sensor location against the original part before installation. Inspect the cooling system for leaks, corrosion, or damaged wiring at the sensor connector, and replace coolant as needed during service. For fitment confirmation, match your vehicle to the listed applications: Fits 1994-1995 Mercedes-Benz S350, N/A; Fits 1990-1993 Mercedes-Benz 300D, N/A; Fits 1992-1993 Mercedes-Benz 300SD, N/A; Fits 1991 Mercedes-Benz 350SD, N/A; Fits 1990-1991 Mercedes-Benz 350SDL, N/A.

Quality Assurance

Facet is a recognized aftermarket brand for engine management and sensor applications. Part number 7.3139 is cataloged for the specified Mercedes-Benz fitments and cross-references Facet application listings for the same use.