Genuine OEM Audi Oil Pressure Switch, part number 09D919081. This critical sensor monitors the engine's oil pressure, sending a signal to the vehicle's warning system or gauge to alert the driver of low pressure. It is typically threaded into an oil gallery in the engine block. Constructed from durable brass and electrical components. Weighing 0.02 kg, it measures 0.025m x 0.02m x 0.02m. Using a genuine OEM switch ensures accurate pressure readings and reliable electrical signals, which are vital for protecting the engine from lubrication-related damage.