A Vehicle Speed Sensor (VSS) is an essential component in modern vehicles that measures the speed at which the vehicle is traveling. It typically works by generating electrical signals based on the rotation of the wheels or the transmission output shaft. This information is crucial for various systems, including the speedometer, anti-lock braking system (ABS), and engine control unit (ECU). The VSS helps ensure accurate speed readings, which can affect fuel efficiency and overall vehicle performance. When the sensor malfunctions, drivers may experience issues such as erratic speedometer readings or problems with automatic transmission shifting. Regular maintenance can help ensure the VSS functions correctly.