Chevrolet 2002 Malibu Owner's Manual page 68

When a new vehicle is delivered, the key has a bar
key tag. This tag may be removed by your dealer before
it is delivered.
One key is used for the
ignition and all other locks.
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coded
Each tag has a key code on it that tells your dealer or a
qualified locksmith how to make extra keys. Keep the
tag in a safe place. If you lose your keys, you'll be able
to have one made easily using this tag.
If you need a new key, go to your dealer for the correct
key code. See "Roadside Assistance" in the Index for
more information.
NOTICE:
Your vehicle has a number of new features that
can help prevent theft, therefore you can have
a lot of trouble getting into your vehicle if you
ever lock your keys inside. You may even have
to damage your vehicle to get in. So be sure you
have extra keys.
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