warning lights
2002 grand am 3.4, service vehical, abs, traction control, service engine, all of this lights are on, i have changed both of front berrings, also O2 sencer, bank 1 sensor 1 need to be replaced, after changing berrings lights went away and came back, now it is reading LF berring short and then RF berring short it keeps going back and forth, please help me find a problem and fix for it