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Have you had the battery disconnected. I had a '99 that would lose the remote function if I had the battery disconnected for any length of time. The key fob contains 2 alarm parts. There's the chip that is detected by the ignition which will alarm if you turn the ignition switch without a correct key. There is also a code that the fob transmits to the car to remote unlock. You can take it to a dealer to reprogram the alarm computer to accept the remote, however as noted above, if you don't have the key number (comes as a white easily lost strip of paper) you're probably going to end up buying a new one. Total cost about 2 hours and ~$250. And it has to be a dealer because the factory won't give an independent shop the codes even if they have the correct PIWIS or whatever the newer version is.
From experience, write down your key fob numbers and the unlock code for your radio somewhere that you'll be able to find later.
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