97 Expedition, NO numbers from rear o2

Guy at work. Like it says, NO information from either rear o2 sensor. as in bank 1 sensor 2 and bank 2 sensor 2. Just hooked it to my reader in the 10 minutes I had, did not put a meter on the sensors themselves, just seems unlikely that it would have 2 bad sensors at once. I traced the harness up to the firewall from the sensors and its not chaffed or anything, any ideas? Both rear sensors read 0.000 on a scanner, no info from them at all.

Check the Heated oxygen sensors (HO2) fuses.
(4-wire)

No kidding? The 02 sensors are on fuses? I will tell him to check that; its his fiances rig. They live together, but he rarely drives it.

Got a schematic, there is no fuse protection that effects the sensors. Just need to ohm them I guess and see if the sensors are even working. By looking at the schematic it is either that both sensors are bad or it needs a pcm. I find either unlikely, but I'll get him to bring it to me to look at further; I'll let ya know.