Need help with a cel

[xx_s4quattro_xx]

Ok so i was driving home last night from the beach and i drove the car a little hard. You guys know how it is when you have a s4 with all that power well anyways stopping at a light a CEL pop up so i took it to auto zone today the code that popped up was p1139 any idea what this is i search and found 17547 P1139 Long Term Fuel Trim Add.Fuel,Bank2 System too Rich but dont understand it. Any help would be great thanks.

[AudiSportB5S4]

hmmm. did the car feel any slower after the CEL? like was it in limp mode?

[xx_s4quattro_xx]

no it actually was pulling the same