This little guy basically monitors the temperature of something – usually engine coolant or sometimes engine oil, or even intake air. It doesn’t just read the temperature though. It’s a switch, meaning it flips on or off at a specific temperature point. It sends a signal to your car’s computer – the engine control unit, or ECU – letting it know if things are getting too hot or are within the normal range. It’s a simple on/off message, not a precise temperature reading like some other sensors. Think of it as a safety guard for your engine. The ECU uses the information from this sensor to adjust things like the cooling fan, or even the fuel mixture. If the sensor says things are getting hot, the computer can kick on the fan to cool things down, or adjust how much fuel is being used to prevent overheating. It often works with other temperature sensors that provide more detailed readings, but this one is key for activating certain responses. It's a critical part of the overall cooling system. If this sensor fails, your engine could overheat. You’ll notice if it’s bad because the temperature gauge might read normal even when the engine is running hot, or the cooling fan might not come on when it should. That can lead to some serious engine damage pretty quickly – warped cylinder heads, blown gaskets, the works. They’re pretty reliable, but they do wear out eventually. If you're getting a check engine light, and it's reporting a problem with the coolant temperature sensor circuit, this is likely the culprit. You can find replacements at places like Fixparts Online, and it's usually a straightforward repair, but definitely don't put it off if you suspect it's failing. Backed by trust: Switch Sensor (MPN TSW12D) comes with a 12-month warranty!

About MAHLE

MAHLE drives advancements in vehicle efficiency and sustainability with its engine components and filtration solutions.

Why Choose MAHLE?

• MAHLE parts are built to last, using high-quality materials and advanced engineering so you get reliable performance for years to come. • We make a huge range of parts, from engine components to filters and HVAC systems, meaning you can get almost everything you need from one trusted brand. • MAHLE is an original equipment supplier to many major car manufacturers, so you know our aftermarket parts meet the same tough standards. • We’re constantly innovating to improve our parts and develop new technologies, keeping your vehicle running efficiently and smoothly. MAHLE delivers excellence, FixParts Online delivers to your door.