New MG ZT cdti owner needs some help with fault

Just bought an 03 reg ZT saloon it needs a few things sorting. Right straight to the top it has an ABS warning light on the dash 90% of the time, i looked quickly at the wiring on the car and found the drivers side front had a broken wire from the pad sensor so i replaced it and now i have both the abs and the low pad warning light showing although the pads and discs look very good. The car has had rear discs very recently is it possible to think they may have knocked the sensors? I dont currently have a code reader is the best action to get the codes read first? The car also has a fault with the pixles on the dash board computer screen( not the mileage but the large screen) any ideas on best coarse of action? Many thanks

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