Hi guys, mate just got this Vento but it feels a bit on the slow side compared to the othe Vr's I've driven. We have VAG-COM'd it and this fault keeps coming back.... 00540 KNock Sensor 2 open or short to ground Could this be the cause? Also I think the head has been off at some point in its life would it be worth checking the cam timing? Any other pointers?help welcome. Thanks John