Tag Page Immobilizer

Tiny clear chip fell out of my key fob. Now my 2006 CRV won't start. What is this thing?

I dropped the main key to our 2006 Honda CRV and a tiny, clear piece popped out and is lost. The car cranks perfectly fine but won't catch. I know the rest of the key fob circuitry is okay, and the battery isn't even required to start the car. I tested it by holding the spare key's broken plastic shell—which still has that tiny part—next to the ignition with the damaged key inserted, and boom, it starts right up. What exactly is this essential little component? Is it some kind of radio transmitter, or just the security chip for the immobilizer system? I need to know what I actually need to replace. #MechanicAdvice #CarHacks #Immobilizer #KeyFobRepair #Cars #Honda