Which MAF part number do I need?

[94Reborn]

My ranger has a 92 explorer 4.0, but a 91 ranger 4.0 pcm. I am getting a MAF voltage low code, and after checking it, the output voltage signal seems wrong, so I'm going to replace it. I would assume then that I need 91 ranger MAF, is this correct?

When I called autozone they said there's 4 different MAF's listed and I would need the part number off of mine, but I'm not sure mine is right, as it is from a junkyard explorer. Does anybody know which MAF part number I need?

 

[94Reborn]

Looking at part numbers on autozone and oreilys online, they show 1 part number for all 4.0's, and then a few other part numbers that vary, I'm assuming they are cali emissions or something. But I got the one that is the same across the board and swapped it. The check engine light went away, but after about a mile it came back on. I came back and ran codes and its 41- oxygen sensor lean, or always low reading. I think this is because I have the 2 o2 sensor harness hooked up to a single sensor pcm. I thought just hooking up one would suffice. And I still believe this to be true. Looking at the schematics on alldata I think I just hooked up the wrong one. It shows o2 sensor bank one on the passenger side, and I have it hooked up to the drivers side. I'm going to switch the sensors location and see what happens. I know nobody seems to be following this thread, but in case someone else gets in this problem they will have a few ideas.

 

[94Reborn]

Switched the sensor to the other plug on the passenger side. Truck runs great and has no more check engine light!