All 4 O2 sensors - no voltage?

[tmsoko]

My sister's Explorer with the 4.0L SOHC is running like crap. I just checked the vitals with my Auterra OBDII reader and came up with P171 and P174, lean banks 1/2. I also checked all sensors. The first thing I noticed was all 4 o2 sensors were not responding. The fuel trims are also all at -100%

I am 4 hours from home (and my manuals) does anyone know what may be causing this? I thoguht maybe the sensor common voltage, but here MAF, CPS, TPS, IAT, and CTS all work perfectly.

Any thoughts???

 

[Billy177]

check your fuses and reset the computer also has she had the intake manifold gaskets fixed and the timing chain stuff both under recall this will cause the lean condition

 

[Doug]

have you checked the wiring harness and the other connectors for the 02 sensors? i highly doubt all 4 sensors went bad at the same time, it's probably a bad connection some where. it is possible it's your lower intake seals that are leaking like billy mentioned. A friend of mine had that problem with her truck, everytime it got cold it would run rough and get really bad gas mileage.