hello we bought a passat bj 2000 4 months ago. right in the first days he started to smoke and went out constantly while driving. the error, defective throttle valve unit was replaced free of charge by the dealer. now comes the hammer. for 2 days he is standing with a motor damage in the workshop of this dealer. however, he does not want to give guarantee, because it is a spark plug, of which the medium electrode has broken off and fallen into the engine and since the spark plugs are wearables now, he does not have to give any guarantee. since we would have just had pech meant he. ngk, however, there is 2 years guarantee on ignition plugs. if this damage was caused by these candles then they would have to stand for it now. maybe there is someone out with this guarantee and guarantee paragraph? a lawyer or expert I can not afford, where should I turn to?