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  1. A150 Humming noise when idle towards the back of the car

    W177 Technical
    Hi all, Just got a 2006 1.5petrol 70k miles and was running ok for the first 200km, after a short stop start there is a humming noise from the back of the car, like a chainsaw, at idle and when driving. You can hear the noise inside better then outside and around the exaust at the back...