Found this link while surfin' around,sometimes we need to know engine codes relative to the model etc.
Hope there is info that is helpful
http://www.sun-diagnostics.com/intl/...l/full_vw.html
http://www.sun-diagnostics.com/intl/...full_audi.html
http://www.sun-diagnostics.com/produ...f/VAG5x-VW.pdf
Pete Mk1