EPC, ABS and Electronic Engine Control light

At first when I would drive my Skoda the Electronic Engine Control light and EPC light would come on but I didn't notice a difference in the way the car was driving. I took it to a garage and they fitted a new sensor in for me, a few days after the lights came back on, sometimes the ABS light comes on too and usually when it does the car cuts out, also when the ABS light has come on before I haven't been able to push the break pedal and have had to use the hand break to stop the car!! Anyone know what this could be? 

Thanks