I'm getting a bad misfire under boost in the S3. It only started yesterday on the way back from crimbo shopping, went to over take something and she had a bit of a stutter. Put it down to one of those things and carried on home. Worse today, was bad on the way to work, and has now developed into a bad misfire as soon as you get anywhere close to full boost. VAG COM has thrown a 16514 DTC, which is Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit - intermittent. This code has been there for a little while now, and i thought it strange that it would start causing problems all of a sudden... Any ideas good people, before I am forced to burn it?