2005 Subaru Impreza Owner's Manual - Page 107

Keys and doors Never leave your vehicle unattended with its keys inside. Before leaving your vehicle, close all windows and lock the doors and rear gate. Do not leave spare keys or any record of your key number in the vehicle. Security ID plate Do not place the key under direct sunlight or anywhere it may become hot. Do not get the key wet. If the key gets wet, wipe it dry with a cloth immediately. A B UB2534BB A) Key number plate B) Security ID plate The security ID is stamped on the metal plate attached to the key set. Write down the security ID and keep it in another safe place, not in the vehicle. This number is needed to make a replacement key if you lose your key or lock it inside the vehicle. This number is also needed for replacement or repair of the engine control unit, immobilizer control unit. 2-4