Hello, the error code P1171 means - Throttle Actuation Potentiometer Signal 2 Range/Performance. Which my shopkey doesn't give to much information on.
As for P0456 - Evaporative Emission System Leak Detected (very small leak).
Now the reason that they don't appear until you drive for a bit is the computer doesn't see it until say the car has been running for a bit. The cars computer almost gives the system leeway for leakage, but since it has not gone away, it lights up your lights. Now when you restart the car it's like restarting a computer (no pun intended). It's essentially a restart.
I would have the EVAP system tested (at a dealer or similar auto shop). And as for the first error code it seems to be a bad sensor.
Hope this helps a bit :)
Sounds like you have and issue with your throttle sensor from the 1171, not sure of the others as they are not on the list so please verify. Here is a link to the codes for future reference, scroll to the bottom which list the DTC's..
http://www.bentleypublishers.com/tech/vw/vw.dtc.table.htm
Hello
The engine
and transmission in this cars drive train are fully
electronically controlled by a computer called the PCM (Power Train
Control Module). Whenever a problem like this occurs the computer
stores a record of the problem (there are of course some exceptions
to this, like the fuel pump, engine coolant temperature sensor and
MAF sensor for instance) in the form of a fault code in its memory,
to read these fault codes you must have the systems memory scanned
with a special tool. Once the fault code(s) are read you then must
perform the appropriate diagnostic testing to find and resolve the
problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN
HAS DIAGNOSED THE PROBLEM TO AVOID SPEDING YOUR HARD EARNED MONEY ON
PARTS THAT MAY NOT CORRECT THE PROBLEM
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