Hi All,
My X5 was getting the error codes that both bank O2 sensors were trying to adapt beyond limits. This immediately led me to believe that there was a vacuum leak. Lo and behold as I was began searching, there was a vacuum line disconnected. It is the vacuum line that is attached to the dipstick tube. Does anyone know where that connects to? I have tried looking but cannot see any fittings that look like a vacuum hose fitting?