How long does the buzzing last after you turn the key? Does it go on forever? Does it continue buzzing when the engine is running and you are driving the car? For how long? Mine went on for approx. 10 minutes after starting off on any journey hot or cold and anytime of day. Thats why it was so annoying with rear passengers asking me , hey what is that funny sound coming from the back. Jokingly I told them that I have some "pet" bees in my boot and they are telling me to drive carefully and not to back into another car or lamppost. LOL.