Posted by David Greenwood David Greenwood
on August 23, 2016, 9:59 pm, in reply to "Ford Fiesta 1.4 TDCi 2011 - Switches from overboost to underboost #"
Well the under boost is probably due to limp mode, caused by the over boost code. I would check for sticking VNT arm or less likely incorrect turbo adjusment
Message Thread 
Ford Fiesta 1.4 TDCi 2011 - Switches from overboost to underboost # - Richard Ryles August 18, 2016, 5:34 pm
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