I would like some clarification if possible regarding a loud rattle snake noise at 1200 RPM to 3000 RPM on my 2011 2.0 petrol Octavia VRS which iv'e had since new. It's gradually got louder as the months have progressed and its been on the ramp to look underneath for a loose heat shield or something but nothing. The noise sounds like its coming from the back of the engine somewhere so when my neighbor popped his head out (who works for BMW) when i had the bonnet up he said that's injector noise