Error message was displayed on the foxwells screen, something like "operation failed" or similar. It was displayed as soon as I cliked on the start.Thanks for getting back to us. I know there are differences in the Foxwell software capabilities between various era Cayenne's (excellent on a 955/957, adequate on a 958) so it's not a huge surprise that the calibration for a 981 might not work correctly. Was an error message returned? How did it indicate it failed?
It looks liks foxwell is not very useful for 981, you can reset errors and maintance intervals, but not much other tham that (no overrev reports, nor PDK calibration...)