P0161 O2 sensor code???

01-18-2009, 10:31 AM
2000 new body style tahoe 5.3 v8 4x4 automatic with a/c

a couple days ago while driving the service engine soon light came on. my brother-in-law had a code reader and came up with P0161 heater circuit bank 2 sensor 2. from what little i found about that code online, it sounds like an O2 sensor issue. the information i found is conflicting though. one place says bank 2 is drivers side, while another site says bank 2 is passenger side. both say sensor 2 is downstream of the cat. so i have a couple questions...

i just want to confirm which side is which.
how many total O2 sensors are there on this thing?
what are the odds that its actually the O2 sensor and not a short or other issue within the system.
last one... if there are more than 1 O2 sensor, are they all identicle or is each one a different part based on its position?

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