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Ford Fiesta 2009 1.6CDTi Underboost Error P0299


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Hi, 

Having massive difficulty solving this P0299 under boost error that only comes on when engine is under extreme torque e.g. going up a hill in 4th or 5th with foot hard down. Tried changing boost control valve at back of engine, EGR valve, air Filter, MAP and MAF sensors, oil & filter and the turbo. All usual suspects checked for leaks and smoke tested. Any advice would be appreciated. 

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