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Not much info to go on but I'm assuming the vehicle has three 02 sensors, one after each bank of cylinders on that V6 and one after the catalytic converter. Bank 1 sensor 2 would be the 02 sensor after the catalytic converter. This B1 S2 monitors the catalytic converter activity. It could be the catalytic converter is at fault. It would be of help to know what the code # was.

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16y ago

What else can I help you with?