[TW]Fox said:The three power outputs for the 1.9TDI are are 100bhp, 115bhp and 130bhp. Above that you have the 2.5TDI which was available initially in 150bhp and later 163bhp.
No idea how you'd tell them apart.
The Golf Mk4 TDI power was denoted by the number of red letters in the TDI badge. A red 'I' meant 130bhp. Red 'TDI' meant 150bhp. All silver meant 100. However this isn't entirely accurate, as dealers badged up the cars, and sometimes badged them up incorrectly.
On the Mk5 Golf, the early 140bhp TDI's were badged as '2.0 TDI'. After the early batch, both 105 and 140 were just badged with silver 'TDI' badges.
Not sure if Audi followed this flimsy system.