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How do you reset anti theft system on a 2001 Nissan Pathfinder le I had new battery put in now it crank It has factory security as well an alternative key under the dash?

To reset the anti-theft system on a 2001 Nissan Pathfinder LE, here are the steps you can follow:

1. Gather Necessary Items:

- Working key/fob for your vehicle

- Alternative key stored under the dashboard

2. Open the Driver's Side Door:

- Use your working key/fob to unlock and open the driver's side door.

3. Locate Alternative Key:

- Under the dashboard on the driver's side, you should find a plastic cover or compartment. Remove this cover to access the alternative key.

4. Insert Alternative Key:

- Once you locate the alternative key, insert it into the ignition cylinder and turn it to the "On" position without starting the engine.

5. Turn Key to "Off":

- Leave the alternative key in the "On" position for about 10-15 seconds, then turn it back to the "Off" position.

6. Remove Alternative Key:

- Remove the alternative key from the ignition cylinder.

7. Insert Working Key/Fob:

- Insert your working key/fob into the ignition cylinder.

8. Start the Engine:

- Turn the key/fob to the "On" position and start the engine.

9. Drive for 10-15 Minutes:

- Drive your Pathfinder for about 10-15 minutes to allow the system to re-learn and synchronize with your working key/fob.

10. Test the System:

- After driving, turn off the engine and try to start it again using your working key/fob. If it starts successfully, the anti-theft system has been reset.

If the anti-theft system does not reset or if you encounter any issues, it's recommended to consult your vehicle's owner's manual or seek assistance from a certified automotive technician or a Nissan dealership.