hi all. i have a micra 1.4 se k12 shape. i have recently swapped the front pads and discs and also rear drum and wheel bearing. since this the abs light has been on and it wont go off. it is also being displayed on the computer. i have tried disconecting the battery and i have had my friend (a mechanic) check all the sensors are connected properly. any help would be greatly appreciated. thanks in advance.