There is no such thing as code P017T.
Here is the full list of VW codes ==> http://www.bentleypublishers.com/tech/v
I am suspecting that you really mean code P0171. (becasue your engine only has a "bank1")
Most likely problem is your MAF sensor (MassAirFlow). At one point, the MAF had a VW 'extended' warantee against it because the early 2000-2002 had a known issue.
Second possibility is bad O2 (Oxygen) sensor.
Source: personal experience