It's probably one of the oxygen sensors, there are 4. Two are ahead of the catalytic converters, 2 are aft of them. Not sure exactly which one the code points too, but it is probably one of the ones behind the converters. If you clear the code and swap the two aft sensors, you should be able to verify this by the new error code that will be generated. The sensors are relatively easy to change, and are worth about $60 each, and they are available over the internet.
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