Here's a link which list all codes which are recommended to the manufacturers. This is what it has for P0633.
P0633: Immobilizer Key Not Programmed ECM/PCM
http://media-server.amazon.com/media...L000027526.pdf
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2002 Inferno Red PT Limited
Photos and more at: http://www.randgraphics.org/PT_Cruiser/demos/index.htm
Mercedes Wiki
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