Getting the above error in my A4 1.8T Sport. Does it mean the lamda is goosed? Im also getting no boost from the turbo but nothing other to suggest a problem. i did have N75 errors so replaced the valve and wiring to the valve which seemed to fix the n75 error but still no boost. Ive changed the dump valve as well. Dont think its the MAF cos there is airflow readings on vagcom???? Any ideas? Help??