My 2000 xj has been throwing codes p0152 and p0158 which are the o2 sensors reading high voltage. I replaced the 2 sensors with cheap sensors and the codes were still there. I bought some ntk sensors and cleared the code and it showed up again. From what I looked at the wiring going from the connectors look fine. I've looked all over for an answer but havent found anything. I've tried two different pcm's with no change. And help would be great. Thank you.

 

You can look at bad wires all day and never see a problem. Test them with a meter. Also check your O2 sensor heater fuse and relay.