the VAG COM has a block that allows you to see when the knock sensors are in operation, you can log it to an excel file that will show you the operations all the way through.... it's quite hard to hear knock when your screaming it, i didnt know mine was pinking until it was on the VAG COM and the knock sensors are in the high 12's!! (very bad) Just wait until you get your VAG COM, I cant remember if it was black 7 or 10 now..... Pete