Here i got these 2 codes on my 02 D17A2 civic. First code came up about a week after i finish working on the engine is the p1505 shows pcv valve air leakage and there are no vacuum leak anywhere, my pcv valve is new. I know it could be air in the cooling system causing the p1505 code because i read posts with people having the same issue. I bled the system and the p1505 code went away and came back a week later with this other code p0325 shows know sensor (bank 1 no signal) i also know that the cooling system can cause the know sensor to come on as well if the air the system is too much. I bled it this morning for about an hour but not be able to get that light off like before after bleeding the system the light went off. Any suggestions on this would help.