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The anti-theft system in the 2002 Nissan Altima may prevent you from accessing your car for various reasons. To troubleshoot, you can try resetting the system by disconnecting the battery and keeping the car off for 10-15 minutes. If that doesn't resolve the issue, attempt to identify the cause by setting the key to the ignition and turning on the panel, then turning the key in the side lock and holding it for 30 seconds before restarting the car. If these steps don't work, you may need to have the car reprogrammed. It's advisable to seek guidance from a dealership or mechanic on the best course of action.
To deactivate the anti-theft system of a 2002 Nissan Altima, you should insert the key and turn it to the on position, try to start the engine, and then leave the key in the running position for 10 minutes.