Mercedes boss Norbert Haug has apologised to McLaren for the number of engine failures they have suffered this year.

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Even in its test flights in 2010 and 2011, the jet experienced electrical problems and engine failures, CNN reports.

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To measure the frequency of repairs for a particular vehicle, it compared the percentage of reported check engine failures for that model to its share of all 136 million 2002-2012 model-year vehicles on the road.

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