Lost Only Key, What Parts Do I Transfer From Another Prius?

I think you need to change all the computers as they are programmed to the ECU...Im pretty sure the BCM (body control module) and anything else linked to the security system has to be swapped...might be smarter just to pay the dealer the $300 - $400 to get a new key made..

looks like you have to find and change all these parts

04-09 Prius Hybrid Smart Key Ignition System Set HV ECU Module immobilizer FOB | eBay

 

You will, of course need to get replacement fobs.

Checking a different thread on PriusChat says....
"There is no need to swap any hardware if you have Techstream and a valid passcode. "

You will need to use the key programming function of Techstream. It will generate a 96 digit hex code. Using this hex code, you then have to pay a service to generate a passcode (reseed code) for you. These services are readily available to locksmiths with security credentials. For the average Joe, usually you end up turning to online services outside the US.

 

will the purchased pass code work with the "amazon/ebay" techstream or does it only work with the real and registered software?
and where do you get this code?
I also need to reprogram my master fob to get the SKS to function again

 

You basically will be wiping all keys and starting over.