Little detail because of the variants,
This review is from: VW Beetle Petrol and Diesel Service and Repair Manual: 1999 to 2007 (Haynes Service and Repair Manuals) (Hardcover)
Described a hardback - but this paperback manual will not lie flat, the cover ripped off, before I could impress my oil ' ly fingers.
Bob Henderson did his best, but due to the number of engine variants of this model turbo / auto / diesel. I still don't know the part number to begin sourcing a replacement defective throttle potentiometer.
I thought manuals were to minimise expensive dealership computer diagnostics