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I don't have an answer to your question. But are you aware that you will get 4 sets of keys with your (new) Lexus purchase? Two of the keys have all the remote funtions, one is a vallet key (doesn't have a remote), and one is for emergency use; it's a flat key that comes with computerized card. Someone else may be able to explain this better.
My husband and I were also thinking of purchasing extra sets, until we took delivery and were given the 4 sets of keys. I'm pretty sure this is standard equipment that you're suppose to get with a new vehicle purchase. Hope this is helpful.
The price over at lexus-parts was only $160 per key. However, I'm going to give them a ring and see if they see me in the system. If so, hopefully I can bring them to my dealer and have him take care of the extra keys at no charge , when I pick up the car.
I did find instructions on how to program the keys on the RX300. I'm just not sure how applicable it is for the 330.
Have you asked your dealer if he will match the $160 price plus set it up at no charge? You should ask them to do this as a good gesture..., since you're purchasing the vehicle from them. As far as I'm concerned, the negotiations are not completely over until you've taken delivery of the vehicle. ;-)