Coolant Fluid Level Sensor Mercedes Vito W639 W906 Expansion Tank A2038700951

Mercedes Vito W639 W906 Coolant Level Sensor is an original part from the Mercedes group, designed for precise control of the coolant level in the system. The sensor works with the vehicle's electrical system, transmitting a warning signal to the instrument cluster or control unit, allowing for quick detection of fluid loss and reducing the risk of engine overheating. This is a practical service solution for Vito W639 and W906 users who want to restore the proper functioning of the cooling monitoring system.

Specifications and technical data

• SKU: A2038700951
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2038700951
• Substitutable numbers: A2038700951, A 203 870 09 51
• Category: Transmission Sensors

Sensor Purpose and Function

The coolant level sensor in the Mercedes Vito W639/W906 is responsible for monitoring the amount of fluid in the tank or cooling system. When the level drops below a threshold value, a signal is generated that can activate a warning light or a service message. This allows the driver to react quickly before the engine overheats and causes costly damage.

The component belongs to the group of gearbox sensors, meaning it is integrated into the vehicle's electronic architecture and works with the relevant control modules. A properly functioning sensor ensures stable operation of the onboard diagnostics system and facilitates vehicle servicing.

Benefits of Using an Original Mercedes Sensor

Using an original coolant level sensor in the Mercedes Vito W639/W906 ensures:

• Correct electrical characteristics – matched to the wiring and control units used in the specific model.
• Appropriate mounting geometry – the sensor fits into the designated socket, reducing the risk of leaks.
• Compatibility with the vehicle's factory software – no need to modify wiring harnesses or control unit parameters.
• Stable operation of the low coolant level warning system.

This makes the sensor a safe service solution for users who want to maintain the factory operating parameters of the cooling system and vehicle electronics.

Component Characteristics and Condition

The offered sensor belongs to the category of gearbox sensors, indicating its connection to the powertrain and control electronics. The item is classified as used, which in practice means it comes from a dismantled vehicle and has been verified for its suitability for further use. Such components are often chosen in professional workshops as an economical alternative to new parts, while maintaining compliance with factory specifications.

Using a used OEM sensor helps reduce repair costs while maintaining proper cooling system operating parameters. This solution is particularly beneficial for vehicles used intensively, where a reasonable balance between price and functionality is important.

Selection, Installation, and Compatibility

To correctly select the coolant level sensor for the Mercedes Vito W639/W906, it is recommended to verify compatibility by OEM number or according to the vehicle's catalog data. This helps avoid problems with installation and incorrect system operation. In practice, sensor installation typically involves:

• disconnecting the electrical connection from the old component,
• removing the worn sensor from its socket,
• installing the new component in its designated place,
• reconnecting the plug and checking the system's operation.

After installation, it is advisable to verify the system's correct operation by observing the warning lights and, if necessary, performing a computer diagnostic. A correctly selected sensor will not generate errors in the control unit and will provide reliable information about the coolant level.

Why Choose Used Electronics and Sensors?

For components like a coolant level sensor, choosing a used OEM component is often economically and technically justified. You can read about how to safely select used modules and sensors, when they make sense, and what to look for when checking compatibility in the guide: used automotive electronics and sensors – a practical guide from Global Parts.

Other Mercedes Gearbox Sensors

If you are also looking for other gearbox sensors for vehicles of this brand, check out our dedicated offer: Mercedes gearbox sensors. This will allow you to easily assemble the necessary powertrain components in one place.