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Immobilizers are a great way to keep potential thieves out of your car, but it can be frustrating when they lock you out instead. If you're dealing with the immobilizer in a 2009 Nissan Altima, one method to try is disconnecting the negative battery terminal for an hour to reset it. If that doesn't work, another option is to turn the ignition switch to the ON position for five seconds, then to the OFF or LOCK position for ten seconds, repeating this process twice before trying to restart the vehicle. If all else fails, you may need to visit a dealership to reprogram your ECU, as Nissan has a safety feature that permanently locks you out after five failed attempts.
To reprogram the security system for the 2009 Nissan Altima, first, make sure all doors are locked. Next, unlock the driver's side door and insert the key into the ignition. Turn the key to the "on" position, then off and back on twice to reset the system. If the immobilizer malfunctions, the alarm won't function properly.
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