Short term O2 help

[Zinnmaster]

On a cold start the truck starts perfectly. But as the truck idles down and the O2 sensors go into closed loop the driver's side bank immediately goes to -25. The passenger side will stay close to 0. The truck begins to miss fire. I have waited to see if the truck will report a misfire code but it will not. I have 2 scan tools and neither of them will read a misfire counter either. If I let the truck idle it will eventually stall out.
It only does this on cold start. If I drive the truck for a few min or if I give the truck some throttle for a little bit the 02 will go close to 0. My long term fuel trims are
+ or - 5.
Im thinking the O2 sensor is bad. Because there is no misfire when warm or under load it goes away. I don't believe it's a coil or fuel injector issue.
Any help would be appreciated

 

[DILLIGAF]

Test the O2 with a Ohm meter

 

[dolcar1220]

I have a 2019 Ram 1500 Limited 5.7 Hemi gas...ive been getting P0175 codes; i do have a slight rough idle. Today when i drove it, made horrible sound like when timing is off; not during idle though. I though it was low or no oil but oil pressure was high 40s hitting 50. When i took it to Oreilys their scan tool said it was 02 sensor. Today i used JScan tool and my fuel trims are as follows: LTFT Bank1=-24.22%; LTFT Bank2= -26.56%; Oxygen sensor 1 (stft) Bank1 sensor 1 -8.59%; Oxygen sensor 1 (voltage) Bank1 sensor 1 0.76V; Oxygen sensor 3 (stft) Bank2 sensor 1= -6.25%; Oxygen sensor 3 (voltage) Bank2 sensor1= 0.05V. I dont know how to interpret these numbers...are they good, bad, indifferent? Should i get additional info? Any help is appreciated....just want to get my baby back. Thank you.

 

[turkeybird56]

Once somebody chimes in and knows how to read the voltages etc. if O2 sensor use OEM only not any aftermarket. The can bus etc does not do well with Chinese junk

FTR: Bout 3 years ago one of my bank 1 O2 sensors went bad. Replaced by dealer warranty. I drove out of dealership, made left turn went to BK for a burger, 1/4 mile away threw code. Ate and back to Dealership. Talked to SA and they replaced all 4 O2 sensors trouble free since.

Just relating my experience.

FYI: upper vs lower sensors not interchangeable.