neffy46

To answer your question yes the 01 and 02 will fit your 03 LS430. In fact I have an application chart on one of my websites of what fits what. I know I am a Cerified Master Locksmith and have been doing Lexus for over three years now. We can reprogram the ECM's with replacing them. For your car you can program your own remote without having to go to a dealer. If you want programing instructions just e-mail me. BTW the website is http://www.lexusremotes.com/ I hope this helps...