Hi, Has anyone had the following problem, this is starting to become a bit of a pain now. My cars engine warning light came on a few weeks ago, 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 On wednesday I had a very reputable Audi Independent come and check it over, and replace the Lambda Sensor before the Cat. After clearing the code, the car had been driven for a few miles and was given the all clear. Unfortunately, after i drove the car later in the day the engine light came back on after approx 5 miles. They came back and checked everything that had been done, couldn't find a reason for it other than the new sensor could possibly be knackered, gave the car a good test run and cleared the fault code. I was driving the car today and the light has come back again, hopefully they will be able to come back tomorrow to have a look. Has anyone had this sort of problem before ? i am starting to hate this S3 now, it seems every other month i am having to spend out on stupid things!