I bought a brand new denso oxygen sensor for my 2005 pacifica 3.5L but this p0131 code keeps immediately popping up. So I tested the sensors Ohms and it was good. I then tested the 4 wires on the harness and all tested good except for the brown wire I'm not getting 12v there. I looked at the wiring diagram and the heater 12v comes directly from the computer so I backprobed that wire from the computer with the key on and I still don't have 12v so I know the wire is not broken anywhere near the oxygen sensor.

So my question is can I run a direct 12v feed to my upstream oxygen sensor and will that make it throw the same code or any code or do i just have to figure out who sells a computer or who can fix my computer or what else can I check? Thank you.

 

Run threw this first