Quote Originally Posted by p3u View Post
I'll give you a clue. Change anything on your car right before that popped up?
As a matter of fact I did... When I got the RS7 air box I did the initial install. That hose on the bottom was a bitch to get secured. I had a dealer oil change visit scheduled and told them the light came on maybe a day or two after the box went in. I also mentioned that hose on the bottom of the box. My thought was it came loose. When I picked up the car they said the box and hose had nothing to do with it. I contested and told them I was sure there was a correlation. They said coincidence...

They cleared the code, told me it would probably come back, it did before I got home (20miles) Secondary air injection pump for pre-cat heating? Carbon buildup?

That car has never had more than a sip of anything except BP 93 in 5 years of ownership. Now you've really got me curious.