You absolutely cannot, unless you have an open ECU to begin with. Typically this is only sporty type cheap cars (evo, wrx). But even if you were to take on such

You absolutely cannot, unless you have an open ECU to begin with. Typically this is only sporty type cheap cars (evo, wrx). But even if you were to take on such and endeavor the difficulty of such a task and the knowledge requirement will scare off the unexperienced