When mine went it was noticibly lumpy at tick over and you could hear 'pulsing' from the exhaust. At motorway speeds under acceleration there was a distinctive 'tinkling' noise apparent from sat inside the car.
BMW charged almost £2.5k under warranty although they did replace the sensors in the exhaust system whilst they were at it. It would have been just over £2k without sensors but including the head skim.
Mine revealed no fault codes directly related to the issue - only showing a throttle flap potentiometer issue lol!
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Cha'mone Mother F**ker!
Last edited by glendog74; 17-10-2011 at 01:42 PM.
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