Posted by Chris Jones on January 04, 2014 at 13:29:36 from (24.148.141.137):
Check engine light came on yesterday and has been on for a few short trips now on my 2001 GMC Sierra 1500 4.8 V8. Took it by Auto Zone today and they said it was code P0161 or a bad O2 sensor--bank 2, sensor 2. Which he said is the passenger side after the cat. I found some test instructions on it today and found in the wiring harness pin D is receiving 12 volts and pin C is grounded as they should be. On the O2 sensor side of the connection I measured the ohms across these pins and got 4.2 ohms. I'm told it should be between 5 and 16. Still I expected it to be either ok or an open circuit. Does 4.2 vs between 5 and 16 sound like the problem? Or as I write this do you think he got the location of the sensor wrong and I tested the wrong sensor? After all I hear bank 1 is the side with cylinder 1 and I don't know if that Drivers or Passenger side. Too cold to go check the other side right now.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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