Welcome back:
This is a tough one. If I had the vehicle, here is what I would do and in this order.
1) Confirm there are no other codes in addition to the 2195.
2) I would check freeze frame data to see if there is anything I can use to pinpoint any specific issue.
3) If nothing is found with freeze frame data, I would then carefully inspect the wiring to the O2 sensor for fraying, damage, connection, corrosion and so on.
4) If the wiring was good, check for vacuum related issues and repair as needed.
5) If that checks good, confirm there are no exhaust manifold leaks on that bank. The 5.4 is known for leaks.
6) If nothing was found, I would replace the O2 sensor.
The +40 on the scanner indicates the computer is trying to compensate for a lean mixture by making the fuel mixture richer. I would expect it to be like that.
Now, earlier you mentioned that the O2 sensors were checked. I'm starting to question if the sensor itself is bad.
Let me know.
Joe
Wednesday, March 20th, 2019 AT 9:21 PM