Weird issue with Immobilizer

[gmasood]

Originally Posted by CTScott

With the system that you have the portion of the fob that does the lock and unlock is different than the part that does the verification for the immobilizer. The transponder for the immobilizer is a small passive transponder and it may be bad or the ECM may need to be resynced with it (which would require the Toyota service tool).

So you are suggesting that may be the Fobs portion of the immobilizer is bad or it needs a resynch. Can i do it myself or would i have to go to Toyota for that?
Is it possible that the Immobolizer Antenna inside the car between the driver and passenger seat as per service manual is to blame or in your opinion it is the Fob.

Anything you can suggest that I might try myself. Many thanks for the quick reply.