2014 A4 2.0 Check Engine Light
 

Check engine light came one. I'm past the 50,000 mile warranty (I am at 54,000). Audi service department gave me codes: P227900 Intake Air System Leak and P218700 System too lean at idle, Bank 1.

I opened hood and noticed a leak noise coming from picture attached. Does anyone know what part this is? Or why it is leaking? Thanks in advance.