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Where is the B1S2 heater circuit located on this vehicle? on 2001 Chevrolet Blazer

Got a code P0141 and a P0128(which i understand is most likely the thermostat. Which 02 sensor is the B1S2 sensor on the 2001 Chev blazer?

Asked by for the 2001 Chevrolet Blazer
From the fuse box fuse to the o2 sensor then to a ground, usually means bad o2 sensor.
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From the fuse box fuse to the o2 sensor then to a ground, usually means bad o2 sensor.
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