The computer NORMALLY puts the engine in a "limp home" mode allowing you to get to a safe place to have it checked. By driving it further than necessary you may be doing more damage to the engine than what was originally incurred. But realize a check engine light could come on with a trouble code for a fuel delivery problem and your fuel pump could just quit. The computer just logged the fault, but did not shut the engine down, the fuel pump failure did. So some people have thought the computer has the power to shut you down but a sfaety factor was built into the computers allowing you the ooportunity to get the car home and have it checked. Just don't push your luck....so that at the casino.