I've got a Windows Phone 8 as well, and it doesn't support reading texts either.
As far as I know the text support isn't available in any Windows phones currently on the market, so I think you'll just have to wait and hope for an update to the phone (that's what I'm doing anyway)
My Nokia 920 works well with Sync, but it's actually the phone that does the work, as it also works with my wife's Qashqai and my Bluetooth headset. I can listen to, and reply to texts using speech only, even on my bike!
Go to Settings/Speech and set Read Incoming Texts Aloud to Bluetooth and Headsets. I also have the Use Speech when the phone is locked, and Enable Speech Recognition Service option ticked in the same menu.
Frustratingly, customers can't yet download a Sync update, it has to be done by the dealer, and some dealers try to charge. I think you can reset the bluetooth module by removing the appropriate fuse, but i'm someone better qualified will advise.
Just phoned our dealer and our Fiesta does not have a Dpf.
I would be very surprised if that was the case.
This is a quote from the AA
The exhaust emissions standards for new cars have effectively required fitment of a DPF in the exhaust of diesel cars since 2009 when the 'Euro 5' standard came into force. In fact, many cars registered before 2009 will have had one fitted too in anticipation of the change in standards.