I have a 1998 Lexus Gs400 that stopped being able to detect its keys. I got the keys reprogrammed to the cars ecu and that didn’t work. I bought a new ecu and had it programmed and it still not detecting the keys. Can anyone help me with suggestions?

A coil near the ignition ring picks up the RFID signal from your key and sends it to an amplifier, you might need a new ignition coil.

Here is a link that explains in detail...

Good luck...

DIY: Immobilizer Hacking for Lost Keys or Swapped ECU: 9 Steps (with Pictures)