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Where is the B1S2 heater circuit located on this vehicle?

(2001 Chevrolet Blazer)
in Bethel, MN on October 29, 2013
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?
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Popular Answer
of G. T. Service Center on October 29, 2013
From the fuse box fuse to the o2 sensor then to a ground, usually means bad o2 sensor.
of Greg's Orange Auto on October 30, 2013
try www.alldatadiy.com for location
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