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It has to be reprogrammed! Now if you get the computer,key cyl and the transponder from the same car and install all them it will work then. the computer read a signal from the transponder witch reads the key. if they do not match the computer shuts down and will not let the car start.

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Q: Does a computer for a 04 neon need reprogrammed or can you replace with same year plug and play?
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