Havaneca

Hello friend,my car was crashed and after 1y repair chage the ECU becouse was crashed,when i start the car,its working only on 2 cylinders.....The 3th and 4th did not work and give me Errors on Xentry ,friend of main told me that all this error can be from camshaft sensor.Please need help.i delete the stored error but when start the engine they show up again