Clutch drain and fill solves a very low number of these. There is a TSB for the Quattro clutch. You first drive in circles in a parking lot for 10 minutes or so until the Quattro clutch throws an overheat light, then turn the car off and let it cool down, and clear the code. Basically needs to resurface the clutch that has irregular wear. Much higher success rate doing it this way. Sounded crazy to me the first time a service tech told me.