Vauxhall zafira abs and tc problem?

Abs(Anti-Lock Brake System) and TC(Traction control system) lights are lit while driving.





Vauxhall Zafira


2004 Car


1.8


Automatic





while driving these lights are lit and sometimes the control indicator for engine electronics lights up too.





i dont know what the problem is,it'd be very much appreciated, if any one can give me some suggestions/comments.|||Hopefully just a minor problem such as one of the speed sensors and one of the wheels if faulty, at worst the whole ABS system controller has failed. Make sure brake fluid is topped up and all pads and disc are in good condition as well.