hello everyone,im new to this website and so its been very nice. Ive tried searching so as to avoid having to ask but just couldnt find the answer. I am the owner of an 03 ml320. Recently a tapping sound has started coming from the engine,sounds like its coming from the head to me. Im new to M.B. Ill tell you anything you need to know abouthondas but dont know much about these. As i said,tapping sound coming from the head i think,no check engine light.