Genuine OEM Audi Ignition Switch With Housing, part number 4B0905851B. This critical component controls the vehicle's electrical power and enables engine start. It is typically located in the steering column assembly. Weighing 0.381 kg, this part ensures reliable electrical connections and proper security functions. Choosing a genuine OEM ignition switch guarantees precise fitment, correct electrical characteristics, and long-term durability for a vital system.