Hello all! I have a Honda Accord 01 2.3l 4cyl automatic transmission. Getting a weird O2 sensor reading without a sensor plugged in and just figured someone may be able to tell me more if I just posted a picture of the OBD graph. Any ideas as to what could be causing this? Thanks

Upstream on left, downstream on right, neither is attached (also not plugged into electrical connections)

 

So the upstream looks normal at 0V and the downstream is stuck at 1.25V?

What are you trying to troubleshoot? What work has been done on the car already?