Hi. I have issues with 2007 Santa FE Petrol. The engine stopped and wouldn't kick over, mechanic found Crank and Cam shaft sensor faults, replaced these. same issue same fault given, replaced fuel pump fuel filter, no change, found a catalytic converter collapsed replaced and now receiving misfire errors. Timing checked and all fine. Any idea what is wrong with this car? It's been with the mechanic for about 9 weeks and no answers as to what the **** is wrong with it., All spark plugs are new as well. Any ideas would be much appreciated. Thanks