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High positive fuel trims at idle that drop on revving

Frequentfocuser
Frequentfocuser
in General Ford Related Discussions

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Hi everyone. Any help always gratefully received…

Car is Focus 2020 1.0 EB MHEV 155HP.

It has had a P0420 since returning from a garage after they replaced the turbo. Ive now got Forscan (which I don’t really know how to use that well) and noticed the LTFT are high at idle (+20%) and drop on revs/acceleration. Car doesn’t have MAF, only MAP and what I think is throttle inlet pressure sensor near it. It has a wideband B1S1 sensor and B1S2 narrowband sensor was changed by garage. I’ve cleaned IAT, MAP and throttle inlet pressure sensor. If I try to do WOT tests the car accelerates fine to begin with then I hear a deep turbo groan, and on the last WOT test the car hesitated twice when throttle going down. I’ve checked for vacuum leaks with a smoke detector but very difficult to get to turbo as it’s at the rear. Does anyone have any suggestions of what PIDs I could take a post here with a view to getting help. May thanks

Ps does the ltft movement mean leak would not be after the turbo? Thanks

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