This is most likly to be an abs fault, when just 2 lights come on you can turn the ignition of and back on and it will clear the lights until it faults again, then eventualy it will fault bringing 3 lights on (the lights you have mensioned) and then it becomes a hard fault and the lights will stay on until you have the code read to tell you which abs sensor/hub is faulting, and then cleared, it will still fault until getting the faulty part replaced. Hope this helps...