I just bought a 1995 318ti with one master key and one valet key. The master will do everything but start the car. I can start the car with the valet key with no problem. If I start the car with the valet key and the immediately remove it, and then insert master key, it will start. I've concluded that it must be a bad chip in the master key. Can I simply switch the chip from the valet key into the master key?