Weird!
I had A 98 forester turbo (auto) that ran FWD for a while!
Had it in with a few lads (Before my ISDC days so not club traders)
No one could fix it, I thought "feck it" I'll put her through the NCT anyway!
So I replaced a broken rear anti roll bar bracket, and a good few bulbs that were blown,
And when I was diving to the test center, I dropped the boot expecting the front wheels to spin and she just drove on, AWD again, and she was grand ever since!
Some of the autos have a fuse that disconnects the RWD for towing,
Maybe something like that??
Dan