EML on but no codes stored?

A Codemaster OBD2 reader.

Its never failed me yet on many marques.
 
Ive come across this before, It will most likely be the code reader you are using. What car are you reading it on anyways, year? engine?
 
Strange one that , should be able to read it with eobd, maybe the protocol of the codemaster reader you are using is not suited to the audi? , Prob better getting it read with something else if poss, vcds is well with the money.