Well, what will be the result of ignoring vacuum leak?
I've had this problem for awhile now and the codes only showed up in winter. Since my inspection in summer, my car always pass them. There's no hesitation, no rough idling, mpg is still quite good (got 28+mpg on a recent roadtrip), no problem at all with my car. I've tried to get it fixed and changed couple of hoses, yet it's still there.
Recently I get a wheel alignment done by indies. He scanned it and saw the codes. He's asking for $65 to diagnose it and most likely he pointed to oil separator problem. He's asking for $500 for oil separator job. Is that reasonable?