I got an '02 passat with like 8 short to ground codes!! I checks the fuses and relays. i got it APR tuned, K@n filter, manual boost controller! i was installin my boost gauge and after the installation the check engine light came on and spitted out tons of short to ground codes!! i went through all the fuses and relays... what can i do now besides go to a stealership!

 

you either pinched a "hot wire" when mounting guage,or you have polartiy crossed. feel/look around for a burnt or melted wire casing.