I think the transponder is a little glass capsule shaped deal that is glued into the case. I can take my key apart tomorrow and have a look.

 

I've seen videos online that showed a replacement transponder "pill" that they placed in a machine to write the code to...looked like thin capsule just like medicine comes in, about as long as the nail on my pinkie finger.
Anyway, I didn't see ANYTHING in the case like that. There's no space left in the case that would come CLOSE to hiding that. It would have to be only like 2mm long to fit into some tiny crevasse I can't see into...

 

I'm sorry that you are having trouble and that I/we have not been able to help you more. Perhaps all you need is a fresh coding of the keys you intend to use. I have read of instances where some locksmiths have the capability to do that without a PIWIS or you taking a trip to the dealer. You may have to start calling around. At least the immobilizer is not activated and you can still start and drive. Little silver lining anyway....

 

I do appreciate the help, though.
Thanks!
Mike

 

Yes, since it's running now, I can take some time to research a better price for the remote coding...

 

Can you give an update? I am having similar issues, since its years later I am hoping you found a solution