Hi, Has anyone had the following problem, this is getting beyond a joke My cars engine warning light came on in november , i had someone with Vag com check it out and it brought up the following; 17511 - Oxygen (Lambda) Sensor Heating; B1 S1: Performance too low I had a very reputable Audi Independent come and check it over, and replace the Lambda Sensor before the Cat at the beginning of december. It hadn't cleared the problem and the other lambda sensor has now been changed aswell. It still hasn't cleared the fault as it keeps coming back after about 5 miles of driving. Has anyone got any ideas ?? If not, this S3 is getting part ex'd for something that works !