Immobilizer

Hello all i thing if there is way to program arduino like immobilizer key i hav diagnostig who can program a key and the way is just to have the key near the ignishion switch but i am not sure what sensor for transmiter and receiver need i sambody know anything any advise it will be helpfull thanks

How do you want to activate the immobilizer?

actually i want the arduino do the key job

So how shall the Arduino do it? Will it use a relay, or CanBus, or what?