Jetta 2006 tdi ck eng lite is on code shows low mass air flow have spent much money replacing parts to get the ck eng lite off and it is still on. I found a plastic pointed nozzle coming out of a small black hose at the right rear of the valve cover I cannot find where it goes it sucks air in. Does the automatic transmission or the ecm use vacuum to control the transmission shifting. I am afraid to take it back to the VW dealer to find out what is wrong I have spent $2500.00 to get the ck eng lite problem fixed and it is still on. I hope someone can give me an idea on how to fix it.