Chevrolet 2001 Prizm Owner's Manual page 82

When a new vehicle is delivered, the dealer removes the
key tag from the key and gives it to the first owner.
One key is used for the
ignition, the doors and all
other locks.
Each tag has a 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 key, you'll be able to
have a new one made easily using this code.
If you need a new key, contact your Chevrolet dealer
who can obtain the correct key code. See "Roadside
Assistance" in the Index for more information.
NOTICE:
Your vehicle has a number of features that can
help prevent theft. However, you can have a lot of
trouble getting into your vehicle if you ever lock
your key inside. You may even have to damage
your vehicle to get in. So be sure you have an
extra key.
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