I recently lost my one and only key to my Saab 9-5. I know I need to have something replaced...the ignition switch module I believe? And the key has to be calibrated or something to the computer in the car? Basically, I want to know if I can get a used whatever it is I need, and then have my step-dad replace whatever needs to be replaced at home. He knows enough about cars to get the job done. The lowest quote I've gotten from a shop that can do it is $650, which is money I just don't have...can someone please tell me what parts I would need to purchase in order get this whole situation fixed? And if it is even possible to do it at home? Or maybe there is a simpler way? Please help!