So I had only one key to my car. I have one of the keys where you push a button and the key flips out. I lost the part of the key that starts the car, but I still have the alarm that locks and unlocks the door. I was wondering if I need to buy a key and program it, or is my car too old to have an immobilizor. Either way what would be my cheapest bet. I do not have a spare key