Hello everyone. I own a Audi A3 1.8 turbo petrol 2002. Recently I have experienced a beep noise coming from the boot area, I have narrowed this down to being the Central Locking Vacuum Pump Unit. I have looked on line for a new replacement unit but can only see 'used'. These 'used' units can range from £30.00 - to £169.00 and they all promise the same thing. Obviously the huge price difference gives me cause for concern. Can a new unit be purchased and if so where? Or what should I be looking out for regarding the 'used' units. Any advise please. Bob.