[bluejeep]

had the 4 bad O2 codes - resolved. - 2006 wrangler unlimited rubicon with 4 liter 6 cyl
first weird thing is my jeep has only 2 sensors, not 4. So I immediately suspected things other than the sensors.
checked wiring for shorts or melting from exhaust, no probs
checked for clooged cat - showed no signs so told myself thats not it
looked for bad fuse or relay, even moved ADC relay into horn position and tested fine
wanted to check everything before contemplating re-soldering the PCM connectors - was not looking forward to trying that unless last ditch effort
noticed that the cable connection closest to driver side slid in and out with ease, the other 2 were very difficult to remove. McGiver'd a solution to press on all 3 connectors - no code for 70 miles so far

UPDATE AND CORRECTION
So ya, there are 4 O2 sensors
And this has worked well for a year. Now, since it is time for emissions testing, the codes have returned. I will check the pcm connectors first, and fuses or relays. And post findings.

 

[bluejeep]

had the 4 bad O2 codes - resolved. - 2006 wrangler unlimited rubicon with 4 liter 6 cyl
first weird thing is my jeep has only 2 sensors, not 4. So I immediately suspected things other than the sensors.
checked wiring for shorts or melting from exhaust, no probs
checked for clooged cat - showed no signs so told myself thats not it
looked for bad fuse or relay, even moved ADC relay into horn position and tested fine
wanted to check everything before contemplating re-soldering the PCM connectors - was not looking forward to trying that unless last ditch effort
noticed that the cable connection closest to driver side slid in and out with ease, the other 2 were very difficult to remove. McGiver'd a solution to press on all 3 connectors - no code for 70 miles so far