Ford Focus ecoboost 1.0

I bought Ford focus ecoboost 1.0 2017 model at Hyundai Kempton Park last year September. The car since then it had a sensors problems I took the car to the dealership to be fixed 2 times but still the problem is still there it shows the engine mulfunction on the dashboard. So I don't understand how can Ford as a big car company giving us as their customers hard times. I'm very disappointed by Ford no more going for ford again.