Recently my check engine light has come on. Went straight to Autozone, got it scanned, code P0766 if I remember correctly. It is input speed sensor for transmission. About a half hour later light went off, stayed off for a week. Week later, back on, same code, on for a couple days, then off for about 4 or 5 days. Made appointment with my Audi Mechanic, and it came on on the way to his shop. Then on for a week, off for a day, and just came back on. I already suspected my TCM, and mechanic confirmed. I have had no flashing PRNDS at all, and drives decent, even with light on, just seems sluggish taking off. Should I go ahead and change the TCM, or wait for more symptoms, and if I do can it cause more damage to my Tranny. Already hating the CVT and its problems, and will I fix this just to have more problems with it soon? Have 110,000 miles.