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Check engine light is on AGAIN. Code is P0171-I believe this is Bank 1 and eithe on 2004 Chevrolet Silverado 1500

r Position 1 or Sensor 1. First, could someone clarify that for me. Secondly, could you please tell the location and how many O2 sensors I have on my pickup? I think 3. I just had Bank 2 Position 2 replaced about 3 weeks ago. Thanks

THAT IS POSSIBLY A VACCUM LEAK ISSUE OF POSS MASS AIR FLOW SENOR OR FUEL OR SEVERAL OTHER ISSUES. IT MEANS B1 IS RUNNING LEAN NOT THAT THE O2 IS BAD
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