Em 2015
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I appreciate this is a bit of an old post, but i have been searching for anyone else having this problem.
My car (2011 520D M sport with 28000 miles) has been in BMW today to investigate a suspected head gasket. They have diagnosed it as the exhaust gas recirculation system. I didn't have a loss of power. It started with loss of coolant, which initially could not be diagosed. But it later developed into huge amounts of coolant pouring out of the exhaust.
I am now just hoping that this really is the problem and £700 will be the end of the problem, rather than just the first of many things to be replaced before they accept the reality.
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É um problema bem conhecido pela BMW, ja encontrei vários por Forums pela Europa, este é um de 2011.