'02 Passat with short to ground codes!! driving me nuts!
 

Alright guys i need some serious help. I have an 02 passat 1.8T, APRtuned, K@N filter, New performance plugs, 5spd, manual boost controller. My check engine light came on after installing my boost gauge and like 8 of the 11 codes are short to ground codes.
ex. EVAP- short to ground ect.
I couldnt get the number for the code but their are just short to ground. I check most of my relays, all my fuses, replaced two relays. The car runs fine, but it doesnt boost and its running slower than stock! I been struggling for about two weeks...if you can just point me in the rite direction that would be awsome... PLEASE HELP!!