I have had my Fabia just a month. Whenever I accelerate I hear a kind of medium-pitched vibrating noise which appears to come from behind the glove box (No, it is nothing inside the glovebox). It seems to come from the left-hand side of the engine. Automatic gearbox by the way.

Is this something to worry about?

Have you looked inside the engine bay to see if you can locate anything thats rattling and/or loose?

Might be somthing as simple as the washer fluid cap undone? But then again i dont know if you would be able to hear that inside the car? I don't know just an idea. Is it still inside its 3yeear warrenty, if you cant find out what it is yourself, take it to your local dealership.