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Old 01-20-2013, 12:48 AM   #1
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Question Oxygen Sensors, OL faults, and crazy volts

My 02 Zetec is stuck in open loop fault. My o2 sensors are also reading some interesting voltages. Sometimes while engine running there is 0v both sensors, when I turn off the car with key in I read .005v both or .065v both. Also with checking connection and wires it has read 0v upstream and 1.250v down, this was key in engine off so I started it to see what happens and upstream hovered below .050 volts And downstream stayed at 1.250v. I have no ideas of what to make of these readings. It runs like crap and is not drivable. I tried to find melted wires and opened some of the loom but came up with nothing. Not sure if relevant but TPS reads at 18%.

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