OBDII P0125 trouble, celi is not passing emissions Options

[f1yen]

I had 4 codes, but got it down to 1.
P0125, insufficient coolant temp for closed loop fuel trim

So far I have new thermostat, new ECT.
When checking the o2 sensor (upstream), if it is unplugged and I check the voltage between the leads, My values are within range 0-1volt. so thats good.
When I hook the connector back together, and backprobe to get a voltage between the leads, i get a constant .5 milivolt....

I checked the wiring between the conectors and the diagnostics box, and from the connector to the ecu, to see if I had a low resistance > yes
Then I thought that maybe a wire is corroded or something that it cant handle the ammount of power through it... so I wired a direct line from the sensor output to just before the ecu. but same.

(for reference I also had a code for P0141 which is a faulty downstream o2 heater circuit, but i just hot wired some resistors to put the ecu at rest; at least for emissions)

Any help would be appreciated.