you have an intake air leak somewhere- it is registering too lean (P0171) There isn't a lot that can go on this, I would recommend checking all the hose clamps on the intake between the Mass Air Flow meter and the throttle body.
There's always the chance that your MAF is faulty
If you have a scan tool that can read measuring value blocks, then you could see what the MAF long term reading is- in the factory scan tool and VAG-COM it is MVB 32. If it is outside -7 to +7 in the long term reading then the MAF is faulty and having to correct too far. If it's a major deviation in the short term (idle) reading, then you have an air leak.
There haven't been any "common" air leaks on this engine compared to the 2.0T (PCV valve)
You can always check and see if there is a lot of suction on the hose that leads from the PCV valve on the valve cover down to the intake hose near the throttle body.