AudiForums.com - P 299 trouble code

i already searched for this and found nothing but P0299- which means turbo under boost or something like that. the auto store i went scanned it and it came up as P 299 and said it meant air/fuel ratio problem. the CEL came up after i WOTed on a straight but the car felt the same after words. i had them clear the code and it hasnt came back yet but any suggestions if it does what cased it in the first place? its a 2003 a4 1.8tQM with apr 91, k&n filter, and evoms dv. thanks in advance!