Any ideas on what is causing this ticking sound on my 2000 Passat 1.8T? The sound is very noticeable when sitting in the car with the windows down. The audio only picked it up very faintly Seems loudest towards the front of the engine. If I watch closely, I can see the belt tensioner moving in time with the ticking. When I put a stethoscope on various parts of the engine, it is very loud on the tensioner, but I would expect a bad tensioner to have a different type of noise, more like a squeal or grinding.