for the benefit of future forum readers, and despite denials from nearly every lexus service department in PA, it IS possible to reprogram both the door computer and the engine immobilizer to no longer respond to a stolen key. For anyone who is interested, the one service department who would do this rather than asserting that we must spend $1500+ to replace both computers was Thompson Lexus near Philadelphia. While this is quite a drive from where we live, it's well worth the $1480+ we will save. I hope it is the case that the other service departments we talked to are just incompetent rather than malicious. Either way, however, it reflects poorly on them. Motorworld Lexus was of particularly no help whatsoever.