So after getting this 2001 1.8 turbo automatic Beetle running (finally) and driving it around for some time, I seem to have this annoying, repetitive check engine light with a PO411 code. The funny thing is, the check engine light only comes on every 500 miles or so, and only when the vehicle is fully warmed up, like on the freeway today. The secondary air pump is working momentarily as it should when the engine is cold and then it turns off after a minute or two. The inlet and pressure hoses are intact and fully seated. The O-rings are good. There are no noticeable leaks that I can see or hear. I'm confused, because I thought that the secondary air pump is only called for when the engine is cold. If that's the case, then why would it log a fault when the engine is fully warmed up?