Engine codes

[Xiter]

The A2 has apperantly replaced engine codes over the years. Does anyone know why? I'm particulary interested it there is a difference between AUA (2000-2003) and BBY(2002-2005) petrol engines. Have a look:

http://www.autoshoppingcenter.com/Volkswagen/audi_enginescode.html

Don't know if the info is accurate though.

 

[old git]

TDI90BHP registered, 29-10-2004. has engine number commencing ATL and a chassis# wauzzz. Does this mean anything?