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My understanding is that a Lexus dealer can program a new master key from the valet key so that it can start and run the engine.  The valet key has security chip it in it - same as a master key.

Programming the master key's remote function to open the doors is a separate operation and does not require having any functioning master keys - instructions are attached.

I watched Lexus dealer techs program a new master key for my similar 2000 LS400 over and over due to my wife losing hers.


1998 LS400 key programming.pdf

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