I had the same issue. Sadly the pressure relief valve just fell out when trying to replace the o-ring. New oil cooler with ring and relief valve.
Now I have the sensor issue, reads high all the time. Do I NEED to replace the sensor or is it a dummy indicator on the dash only?
2006 Nissan Armada.
I had the same issue and when I replaced the oil pressure sending unit it took care of it on both my armada and qx56
Last edited by jacknovercasher; 03-02-2017 at 11:15 AM.