Genuine OEM Audi Ignition Starter Switch, part number 4B0905849. This critical electrical component activates the vehicle's ignition and starting system, controlling power to various circuits. It is typically located behind the steering column. Constructed from durable plastic and precision electrical contacts. Weighing 0.05 kg, it measures 0.055m x 0.052m x 0.047m. Choosing a genuine OEM switch ensures reliable electrical contact, proper key recognition, and durable internal mechanisms, which are essential for consistent vehicle starting and security.