hi shaft my name Greg, i heard you are good with n42 timing chain jumping problem, my engine works no good,needs more petrol than usually, on the commputer it is three failes, valvetronic servo motor, cut of power and again smething with valvetronic servo motor and my mechanic told me we have to change timing chain bacause probably has jumped... it is possyble to show on the commputer valvetronic servo motor problem without any camshaft sensor problem or something?