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how did you find this out?i literally drove my car for a night went home let it cool,went out next day and everything went wrong at once

Should have been a bit more clear,the "cat" isnt actually there its just a straight pipe from turbo to backbox,the wideband is just after where the cat should be and is the bosch wideband sensor,the pre "cat" sensor is just a factory style sensor that you can just see behind the wastegate in the...

Not 100% but its running an aem wideband sensor after the cat,once the wire was repaired the car ran spot on,drove home parked it up started it the next day and the afr was all over the place,repaired vaccuum pipe from turbo to wastegate today that was split so hopefully thats the overboost...

What would cause the overboost in the first place?and why would it be cutting fuel at 4 psi under normal boost

Over the last week my civic has developed a ton of problems,firstly alternator stopped charging turned out to be a broken signal wire,the car is set to 14psi boost but was boosting to 20psi up until yesterday where it now hits a solid fuel cut at 10psi.the afr at idle is --- on an aem wideband...