"Limp Mode" & service engine light

BangZ

Well after a month now I still don't have the car back! The first shop I went to he found the 02 sensor was broken off cause it wasn't put on right from the factory he sent me the pics attached...he may have found out what was causing it but wants a second opinion before doing the work it's been so long I can't even remember what he said...but now it's at the Dealer and they can't even find out what the hell is wrong with it...they said the cat converter was bad and replaced that (under warranty thank god) and it's still putting out a misfire code...anyone ever go through these problems yet?image.jpg