I did search but didn't really come up with an answer. My check engine light just came on and I scanned it. It came up with p 411. The guy asked me if it was turbo'd because it is a sensore for the turbo or the actual turbo. The turbo seems fine because it doesn't make any noise and still pulls great. What should I look for?

 

If you have 2000+ Audi, it has a secondary air injection pump, and this is something to think about: http://autorepair.about.com/library/a/1h/bl969h.htm