This little guy basically monitors the engine’s coolant temperature. It’s a pretty simple device, really. It reads how hot the engine is and sends that information to the engine’s computer, the ECU. It doesn’t control anything directly, it just reports the temperature. Sometimes it's a simple on/off switch based on a certain temperature being reached, other times it sends a variable signal for more precise readings. The ECU uses that temperature data for a bunch of things. It adjusts the fuel mixture to make sure the engine runs properly whether it's cold or hot. It controls the cooling fan to prevent overheating. It even affects how the engine timing works. A lot of systems rely on accurate temperature data. You’ll notice if this starts to fail because your engine might run poorly, overheat, or have trouble starting, especially when it's cold. Accurate temperature readings are vital for engine health and efficiency. If the computer thinks the engine is colder or hotter than it actually is, it'll make incorrect adjustments. That can lead to poor fuel economy, increased emissions, and eventually, serious engine damage. Think of it like this: the sensor acts like a shield, protecting your engine from overheating or running too lean. We carry a good selection of these, and you can often find the right one quickly at places like Fixparts Online. Getting a good quality replacement is well worth it to avoid bigger problems down the road. Technical support included: Switch (MPN 17137532124) comes with a 12-month warranty!

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• Get parts made specifically for your BMW, ensuring a perfect fit and optimal performance. • BMW parts are engineered to last, meaning fewer repairs and more time on the road. • Using genuine BMW parts helps maintain your vehicle’s value. • You’ll get the same quality and reliability that BMW is known for, giving you peace of mind. BMW delivers excellence, FixParts Online delivers to your door.