Steve B Hill Posted April 28, 2021 Share Posted April 28, 2021 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. Quote Link to comment Share on other sites More sharing options...
Hamzii Posted May 11, 2022 Share Posted May 11, 2022 Hi did you manage to find the problem? I have same fault on mt fiesta 1.6 (90bhp) diesel. Car started to go in limp mode over 100km/h and after i cleaned egr valve i’ve still got engine malfunction service now and car picks up speed very slowly and not like before…. Quote Link to comment Share on other sites More sharing options...
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