2003+ Dodge Neons are equipped with sentry key. In short, the spare key needs a chip that is the same as your normal one. I have an 2002 Neon with a 2004 Neon cluster with sentry key, and my light is always on, but it does not do anything because my car is not equipped with sentry key.
Edit: I forgot to explain better. There is not anything wrong with your car. That is the purpose of sentry key. If you use the wrong key it will start and then then turn off when it sees that you are not using the appropriate key.
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Friday, April 17th, 2009 AT 10:46 PM