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All domestic vehicles have OBD (On-Board Diagnostics), since 1996.
Your car will use OBDII, since it is newer.

You'll need to take it to an auto store to have them use their OBDII Scanner to pull the codes out of your car's computer. This is usally free in the states.

You could also go to the dealer, and have them scan it, but that'll probably run you 45 bucks or more.

Lastly, you can buy your own handheld scanner for anywhere from 40 bucks to 400 bucks... depends on how much information you want to get. I paid 250for a 400 dollar model on sale, and it has paid for itself already.

There is no "Key-Dance" for the Impala.

It is possible that the battery is toast, as they seem to die over quite a range of ages. The owner should check the battery to make sure it is holding a charge, but it does sound like the alternator is on it's way out.
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