Can the new Lexus Flat key be programed to work for a 2006 GS with the smart key system?

The new Lexus Flat key is not compatible with the 2006 GS model that utilizes the smart key system. The smart key system requires specific key fobs designed for that model year, and the Flat key does not include the necessary transponder technology. For programming a key for the 2006 GS, you'll need to use the appropriate smart key fob. Always consult a Lexus dealer or a certified locksmith for the best options regarding key programming.