I have a dead O2 (rear) I unplugged the suspect O2 start up the Disco and all sensors are showing readings, both rears flatline at .8.

This seems weird to me any suggestions or more likely explanation of what I am doing wrong ?

 

Not to state the obvious, but it sounds like a wiring issue. Do the readings on the rear ones change once the engine gets warm?

 

@matt3502 An actual drive is the next test, I did notice the engine side connector is damaged but the connection was sound. I was just not sure when the rear O2's started to respond - and you answered my question need to warm the old girl up

 

@matt3502 thanks for the comment had to pickup some lumber took the Disco and the new O2 start to report the old disconnected one stay at .5 volts. Swapped it out all is good and happy