When I had that fault code with REVO, I phoned them up, they said
"We've had a few S3's with that fault code, not sure what causes it, but plenty of other cars have the same software and run fine , so it must be something wrong with your car"
Bearing in mind I had the same hardware and ran bluefin stage 3, PDtuning stage 2 and shark stage 3 without getting that fault code.............................