Daewoo Kalos 14SX 2003?

I bought this car 2 months ago. Soon after the Malfunction and ABS lights started coming on. The Malfunction light comes on at times flashing and other times it is constant, and is nearly everytime I use the car. The ABS is also on. Have taken the car back a number of times and garage has put it on computer, 1st time they changed coil pack and plugs, another time they changed HT leads. They have told me this fault is doing no damage to the car and to ignore the lights. I am finding this very difficult to do and finding the lights distracting when driving. Can anyone please advise.