There isn't a pressure sensor, there is a trigger wheel in the center of the intake cams. If the cam isn't where it should be when it should be the code will be thrown. If it is too slow it will through a code. The oil control valve may still be getting enough oil, just not the volume so it has a delay. Same with 02 sensors, when they get old they get slow and then throw code even though they are still producing the proper voltage for the 02 content.
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