In 1997 Lexus introduced their first transponder system to North America with the LS400. THe following year they continued the trend across their model base with their second generation system. This 8-bit and then 16-bit system was developed without the ability to introduce new keys into the system without a working master key. In the event all keys are lost or only the valet key is remaining, the cars ECU (Engine Control Unit) must be replaced in order to replace the master keys. Here at DEALERKEYS we have the ability to reflash the ECU and program it back to its factory settings, like new. We have simple instructions on removal of your unit and proper handling. You can then send the unit to us and we will return it with new keys ready to start the car. You need only worry about removal and replacement of the ECU and if a remote is required we will send you simple instructions to program it yourself. With free phone and email tech support you can feel confident in getting yourself back on the road with little headache.