Don't mess with EGR on new Diesels
This new 2.0 tdi engines are not easy to play ,as it used to be on older 1.9tdi - Engines got a lot of sensors which talks to each other .
With Egr on 2.0 - If U blind it somehow , U will get fault on dash after short trip - Insuffiecient egr flow - why ?
Egr is connected in line with Maf ( Mass air flow ) sensor . All talks to Ecu . When Ecu opening Egr , it also reducing boost ( via Weastgate ) to get the same Value on APS ( Absolute Pressure Sensor ).
So if U close it, engine won't get any more power , plus U will get limp mode after short period of time.
There is a way to awoid it ,but U need to be atleast VAG Master tech.
It took me about 3 months to designed special plate with all sort of resistors which I pluged in with Egr cable to cheat it - and finally it did work.
How to do it - longgggg story .
My advice - leave it alone
The best way to clean it - hi octan petrol .