i have a 95 integra and im getting code 13 from the abs light, and i do here the humming noise coming from the pump. that was the first thing i heard when i got the car. and i know the code is high pressure leakage, but my pump is not leaking. is that the prob or should i replace the o-ring like every one says to? is it possible to do by myself? please let me know, thnx