Here's what happened:
* Season 6 of American Idol (2007): The winner was Jordin Sparks, and the runner-up was Blake Lewis. While there were other prizes, like recording contracts, a Ford car was not one of them.
* Season 4 of American Idol (2005): The winner was Carrie Underwood, and the runner-up was Bo Bice. Bo Bice won a Ford Mustang as part of the prizes for finishing second.
So, while there was a Ford car prize on American Idol, it wasn't on Season 6.