Disabling Key Remote

[lexuseng]

Is there a way to disable the key remote? My wife lost her keys (2001 GS300) in a large parking lot where she parks every day. To prevent someone from just strolling through the parking lot with the remote, is there a way to disable the remote temporarily?

[djspawn00]

If you have a masterkey you can program in a new key while also erasing the transponder access for the old key. The old key will no longer work to start the car but I'm not certain if the remote functions would still work.