If you have an older renault with a keyless card, press the lock button two times and it will disable the keylless system until you start the car. It hink this should be the standart.

The newer hyundai and kia dont have a good immo, they can be started by breaking the ignition lock and turning the start key, also if you can catch the unloxking signal you can reuse it. Normaly you wouldnt be able to start a car without an immo chip, that is tied to the car. Normaly you woulnd be able to unlock the car because the remote and the car keeps changing the unlock code, but to make these cars cheeper for America market they removed these futures.