I called the service advisor at the dealer today and he told me that they have no way of telling what the 12 flashes mean because they just hook a computer to the car and read the code. In addition, after I explained to him all of the prior post information (I left out the part about the fuel injection cleaner though) and told him that the car is running good and getting good gas mileage he said that he would not worry about it. He said that if it was the O2 sensor that had gone bad then it would not be running very good.
I will just let them check it out when I take it in for the 90k service.
I am still curious what the 12 flashes mean and would appreciate anyone on here looking and letting me know if they have access to the diagnostic manual.