PO171 PO171 and P1131 OBD Codes 1998 Ford Contour PCV HOSE

I replaced the Mass Air Flow Sensor at first, with no result. Then both Oxygen Sensors, with no results. This is the last one I know of. And the PCV HOSE line was most certainly in need of replacement. $2.45 At autozone for two feet of hose.

Its part of the vacuum system to regulate the air flow to the engine, and as you can see, if it is caving in on itself, or letting in outside air to the engine, things certainly can be amiss in the engine.