Had AYC fluid changed in July last year @ 42,000 by dealer. I think my car was manufactured within the recall dates of the AYC ECU but according to the dealer when I asked previously about a recall on the oxygen sensor there was no outstanding recall work to be carried out.
I had this problem a few weeks ago but after an AYC oil change it went. It seems that the particles in the old oil cause friction between the AYC plates causing it to sound like you've just run over a chickens wing!!!!!