1995 Ford Ranger 3.0 only gets to about 155-165 degrees??? on 1995 Ford Ranger

I can't get my pickup to get to temp. I have replace thermostat, radiator cap, fan clutch ( it was stuck engaged). I have put it on a scan tool cuz it throws engine codes because it wont allow different system to operate till it's at operating temp. The codes it gives are...PO-0124 & PO-5401. Collaborative is up so I'm not sure where the one code came from. Any ideas. I haven't done a coolant flush. Thought????

Asked by for the 1995 Ford Ranger
1 answer 8 comments
Gauge and computer agree?
They seem to, gauge seems low to me as we'll. when I bought the truck it wouldn't even get above the c on the gauge.
Using a 195° stat?
Yes sir.
Try another stat and brand like Stant or one from NAPA. I have had defective new parts before! Thermostat is the only thing that can cause this.
I'll give it a try and let you know, thanks.
THM 530090 is NAPA #.
I'll go snag one right now, thanks.
1038ST gasket as well.