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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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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