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John, the keys are covered by the warranty. Has the key not been used in a while? If so it might have just lost it's initialization. You can do this yourself, here it is: open and close the drivers door. insert the key in the ignition and turn to position 2 (key on) then to the off position and remove the key (this must be done quickly, on, off, remove key). Press and hold the unlock button on the key, then (while still holding the unlock button) press the lock button 3 times in a row, then release all buttons. The door locks should perform a test cycle, which means you were succesful. If so, you must have your other remote key handy to initialize. Right after the first key is initialized (and the locks cycle), grab the other key and simply press and hold the unlock button, and press the lock button 3 times. The locks should cycle again. If you do only one key, the other key will lose it's initialization. So you must do both at once. If it doesn't work the first time, try again. All steps must be performed in a timely manner, and you must open and close the door each time before inserting the key to start the procedure. If you have no luck, you will need a new key. Let me know how it works out.
-Andy
 
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