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Hi,
My son has recently brought a fiesta 1.0 EcoBoost zetec S, all was fine then he had a iflash stage 2 remap done, still all was ok power/ boost wise, couple weeks ago had all induction pipes upgraded, stage 2 front mounted intercooler and airtec air filter, yesterday the vehicle went into limp mode and a DTC related to turbo overboost P0423 , I have checked all vacuum hoses , carried out a vacuum test and all showing ok, it’s had a new turbo and engine fitted, I’m now running out of ideas, any help much appreciated
Thx Stuart
 

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You may want to talk with the tuner to see what the tune is allowing in terms of maximum boost. With all that new hardware, it could be making more boost than the computer is expecting and it's shutting down to prevent something catastrophic form happening.
Do you have a boost gauge fitted, or can you see how much boost it's making from the OBDII port?
 
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