Originally Posted by joelc73
I was wondering the same thing... Does anyone know the answer to this?
it absolutely doesn't lose its registration when you disconnect the battery. i replaced my battery and the issue was the car still had the oem battery as the registered battery. that's why it needed to be re-registered...to let it know that it was no longer the original battery and that it had been changed, not b/c it didn't have ANY battery registered.