It was the salesman who called so he didn't elaborate what was wrong, just that a 'reading' was wrong and they have decided to change the turbo. I suppose I should be happy the fault is being rectified now and not 2-3 months after ownership which would have gave me a bad overall impression of the car. Picking the car up tmw so will feedback and hopefully with a big smile on my face, will be a big difference from driving a disco