my 98 gs 400 will need a new ecm in order for me to have any new keys made .car was certified , lexus and their dealers are ok with selling a car with only 1 master and a valet key, never once mentioning that should you one master go south or you lose same, your are in for a royal shaft job. Lexus will replace your ecm( admit to doing nothing wrong) but you are still at the dealers mercy( also admit no wrong) he wants $600 for 2 master keys(his cost $120) I have been able to find a dealer to make each key for $200 (bargain eh) or its possible to send your ecm to people to reprogram for $100 plus 100 for each master one outfit will do it f0r $630 includes 3 new keys. Motto is demand at least 2 masters when you buy any lexus between 95/2000 model year