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If its an intermitent 0 volts, your o2 sensor is more than likely at fault.Or I guess the o2 sensor wiring is a possibility also.Due to the fragile and easily contaminated nature of o2 sensors the don't really have a long lifespan.
A missing or faulty rear o2 sensor may have effects other than the CEL.I can't say this is fact, but it seems to me, if an OBDII ecu see's a decrease in catalyst efficiency(faulty or missing rear o2 sensor), it may alter a/f ratios to try and bring the catalyst efficiency back up.Proper way to get rid of it, would be to note average rear o2 voltage(should be 0.6-1.0 volts) before you remove the cat.Then put a high wattage resistor(12 ohms IIRC) across the heater circuit, and another resistor(to drop voltage to previously noted voltage) between the b+ heater wire and the o2 signal wire.
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-Nulli Secundus-
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