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Originally Posted by corning_d3
The only O2 sensor that monitors the catalytic converter is the one behind it. It is also called a catalyst monitor. The O2 sensor before it only monitors oxygen levels in the exhaust compared to oxygen outside the exhaust. The O2 sensor after it monitors oxygen levels after catalyst. When an O2 sensor see rich, it will produce about .9 volts, when full lean, about .1 volts. An after cat. O2 sensor will read close to .5 volts all the time if the cat. converter is good. Have you checked the codes yet? The first thing i'd check out would be the fuel pump, fuel filter, fuel pressure regulator, injectors, and maybe even a lazy O2 sensor.
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I have an o2 on each manifold (2), one before the cat, and one after. the one before the cat i replaced a few months ago... if i get the codes checked, will it read the pump and regulator?