You can read-out the computer of your own car by using VAG-com.
A must have for every TDI enthusiasts. It's necessary when you start tuning!!
The programme shows you everything the ECU registries.
Go to the site of Rosstech to read everything about VAG-com
The interface I bought is shown on the pic below..
I purchased the KKL-usb interface from MSmax.
I use vag-com version 188.8.131.52-n.
All risks are for your own account. If you don't know what your doing, don't even start!