BMW E60 X5 E70 X3 E83 E87 E90 E91 F10 Coolant Tank Level Switch Sensor 7546548

BMW E60 E65 E70 E81 E87 E90 Coolant Level Sensor is an original BMW Group component designed to monitor the fluid level in the cooling system. Thanks to its factory OEM specifications, the sensor integrates seamlessly with the vehicle's electronics without requiring modifications, ensuring stable system monitoring and clear warning messages on the instrument cluster. This is a practical solution for users who want to maintain the cohesion of the cooling system and accurate diagnostics of any fluid leaks.

Specifications and technical data

• SKU: 7553919-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7553919
• Substitutable numbers: 7553919, 17137553919, 7526845, 17117526845, 0152373, 17110152373, 7800097, 17137800097, 7524812, 17137524812, 7532124, 17137532124, 7546548, 17117546548, 0409622, 17130409622
• Category: Expansion & Overflow Tanks

Purpose and Function in the BMW Cooling System

The presented sensor is designed to work with Expansion Tanks in selected BMW models of the E60, E65, E70, E81, E87, and E90 series. Its function is to continuously monitor the presence of coolant in the tank and transmit a signal to the control unit and instrument cluster. If the fluid level drops, the driver receives a warning, allowing for a quick response and reducing the risk of engine overheating.

The original sensor design ensures:

• correct fitment into the expansion tank housing,
• stable fluid level readings under typical operating conditions,
• compatibility with the factory BMW wiring and electrical system.

Compatibility and Benefits of Using BMW OEM Parts

The sensor is designed as an OEM part, meaning it maintains factory operating parameters and integrates fully with the vehicle's diagnostic system. In practice, this translates to:

• no need for wiring harness adaptation or modification,
• correct recognition of the cooling system status by the engine control unit,
• compliance with factory warning messages on the dashboard.

By using an original sensor, you can maintain the integrity of the BMW cooling system, which is particularly important when operating the vehicle in varying temperature conditions and over long distances.

Installation and Operational Characteristics

The coolant level sensor is designed for installation in the original component's location, at the bottom of the expansion tank. The plug-and-play design allows for the removal of the old sensor and installation of the new one without altering the tank structure or electrical system. In practice, the replacement process involves:

• disconnecting the electrical connector from the existing sensor,
• removing the component from the expansion tank housing,
• installing the new sensor and reconnecting the plug.

This solution minimizes vehicle downtime and simplifies servicing, while also maintaining the factory seal of the cooling system.

Component Condition and Service Application

The offered sensor is a used part, making it an attractive cost-effective alternative while maintaining original BMW specifications. This type of component is often chosen for:

• cooling system repairs after a failure or fluid leak,
• preventive replacement of the expansion tank along with its accessories,
• diagnosing errors related to incorrect fluid level readings.

Using an original sensor helps reduce the risk of false alarms and communication issues between the sensor and the engine control unit.

BMW Cooling System Expansion – Related Components

If you are planning a comprehensive repair or upgrade of the cooling system area in your BMW and need other components from the same group, such as additional level sensors, tank caps, or complete expansion tanks, check the available parts in the BMW Expansion Tanks category.

To better plan cooling system servicing in conjunction with cabin thermal comfort, it is worth familiarizing yourself with the guide on selecting and operating air conditioning and heating components – detailed tips can be found in the article Air Conditioning and Heating – Part Selection and Maintenance for Year-Round Comfort.