Both my parents and I recently purchased 2011 Prius'. We are very happy with the car but came across something strange this weekend. I was driving with my parents in their Prius, but had by smart key FOB in my purse, an error message came across the screen stating that the key could not be located. The first time this happened the car was already started and continued to drive, but the second time the car would not even start until I took my key out. Has anyone else came across this problem? Is there someplace in the car that I can store my key so the car does not get confused by 2 different FOB's (I was sitting in the back seat)?