The blue balls are the carbon canister on some VAG models, we got the black thing that is easier to see and remove.
Unless you fit a resistor you'll always get the code and CEL. Fit a 330ohm 10-watt resistor. The only CEL I ever get is for the SAI, improper flow, comes up around once every few weeks, even with a resistor on it.
Cheers Rob, i have a 10 w cap on the wiring but get the incorrect flow light (for the carbon canister) about once a fortnight, sometimes weekly, it seems to happen when sitting in traffic ticking over, i cant work out where its picking this up, i put a one way valve on the pipe work but i still get it, also i removed all the pipe work back to the tank leaving about 12inches venting under the back as the engine bay filled up with petrol fumes, i did'nt think that was a good idea. not had the SAI code for months now.