BMW 1 3 E81 E87 E90 LCI N47 F20 F30 N47N Temperature Sensor Coolant 7797957

BMW E60 E90 MINI R56N R58 Water Temperature Sensor is an original part from the Temperature Sensors category, designed for precise monitoring of the cooling system parameters in selected BMW and MINI models. A used OEM component ensures factory fit, stable temperature readings, and proper interaction with the engine electronics, contributing to safe and predictable powertrain operation.

Specifications and technical data

• SKU: 7797957
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7797957
• Substitutable numbers: 13627797957, 7797957, EM
• Category: Temperature Sensors

Purpose and Function of the Water Temperature Sensor

The presented sensor is responsible for measuring the coolant temperature and transmitting the signal to the engine control unit (ECU). Based on this data, the ECU adjusts fuel injection, ignition timing, and radiator fan operation. A functional water temperature sensor is crucial for:

• maintaining stable engine operating temperature,
• protecting the powertrain from overheating,
• correct operation of cold and hot start fuel maps,
• maintaining optimal fuel consumption.

Compatibility and Identification by OEM

This sensor belongs to the group of original BMW parts, meaning full compatibility with the electrical system and control unit software in BMW E60, E90, and MINI R56N and R58 models. Thanks to its assigned OEM part number and available interchangeable numbers, precise verification of compatibility can be done using the manufacturer's catalog or the vehicle's VIN.

In practice, this means that when selecting a part, you only need to compare the markings with the currently installed sensor or refer to the service documentation to avoid issues with installation and communication with the ECU.

Characteristics of a Used Temperature Sensor

The offered item is in used condition, which for original BMW sensors often represents a sensible compromise between cost and quality. Factory manufacturing ensures appropriate resistance characteristics as a function of temperature, as well as proper sealing in the mounting socket. Before reinstallation, it is recommended to:

• check the socket for dirt and corrosion,
• verify the wiring harness and electrical connector,
• use a new seal if specified by the manufacturer.

This will allow the sensor to continue operating stably in the cooling system, without reading interferences or ECU errors.

Benefits of Using an Original BMW Sensor

Using an original water temperature sensor in BMW and MINI offers a range of practical benefits:

• Full ECU Compatibility – correct signal characteristics eliminate the risk of diagnostic errors and incorrect mixture adjustments.
• Stable Cooling System Operation – proper fan activation and engine operating temperature control.
• Hassle-Free Installation – thread, sensor length, and connector match the factory socket in the cylinder head or thermostat housing.
• Consistency with Vehicle Electronics – no need for adaptation or installation modifications.

Selecting a Used Sensor and Expert Knowledge

When choosing a used water temperature sensor, it is advisable to rely on OEM markings and reference numbers to ensure the part will work with a specific engine and control unit version. A detailed discussion on selecting used modules and sensors, including compatibility verification principles, can be found in the Global Parts guide: Used Automotive Electronics – ECU Modules and Second-Hand Sensors.

Other BMW Temperature Sensors

If you are looking for other BMW temperature sensors for your car, check out the dedicated category in our store: BMW Temperature Sensors. Using filters by brand and category, you can quickly find a part that fits your specific model and engine version.