Starts then shuts off

You can bypass the key sensor only but the rest of the system has to be operative.

Pass-lock sensor bypass:

Look for the black wire and the yellow wire from the pass-lock sensor in the column, cut the wires and you can solder in a 2.2 K ohm resistor connecting them together and then attempt to start the car. It will stall do not turn the ignition off. Let the ignition on for ten minutes or until the theft light goes out. Turn the key off for ten seconds then attempt to start the car. If it now runs you have been successful. If it does not you either made a mistake or there are other problems besides the ignition lock cylinder.