Checking Elsawin, that knock sensor code does simply mean too much signal from the sensors, so either an electrical issue or the engine is actually knocking outside the bounds of what the ECU can handle.
I'm inclined to agree its probably old fuel if the car isn't getting used much. The S8, oddly, is much more tolerant to low octane fuel than you would expect. There's no discernible difference in mine using Tesco standard or momentum, although that may be because the engine only has 30K on it. I know Mike does see a difference in consumption on the good stuff. I mostly run mine on Tesco standard day-to-day and it doesn't knock at all. It only gets momentum for longer journeys. The 3.7 however absolutely hates cheap / low octane fuel because its mapped to burn as lean as it can for better economy. My original 3.7 would knock terribly if it had anything other than Vpower.
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