I'm kind of new to this forum, but I need some help with the code P0411 "Secondary Air Injection System Incorrect flow detected",seems like I get this code all the time when I wash my car, or if it is raining outside,I did some research on this site and others, but the one thing I have not seen, is if there is a schematic someone has on how this whole thing works, I checked in the Audi owners manual, but not much is there I can go by,also lots of other forums I was reading, but seems like nobody has an answer for it, any help would be appreciated

 

i would check all your vaccume lines first. Including check valves. U might have a vac leak in ur system.

 

Thanks pa4ul for the quick reply

I did check all the vacuum lines,and they all look in good shape, but why is this code (p0411) is coming up just when I get a car wash or when is raining outside ???

 

no to sure did u make sure the check valves arent getting corrided away. i know at one point i had a studder and couldnt seem to find a hose with a leak. Then i checked under the manifold and the check valve was half way corrided away.

 

Check valves are all in perfect like new condition, but I think the problem might be that I noticed one of the U pipes is cracked underneath the intake manifold, will have to find one of these U pipes and see what happens, hopefully that is the problem, I don't have a picture right now to show, but I will make one