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You don't have to guess about the sensors, you can test them. There should be either three or four wires. One is power to the heater and on four wire systems one is the ground for the heater. The other two are signal wires. The heater is most often the problem.
Having said that, my 2003 Tundra's OBDII system will say if it is a sensor and whether the sensor has a heater or signal problem. Bottom iine, if the OBD says it's a cat, it's most likely a cat.
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