Question about 2003 Hummer H2
What you have to do is replace the o2 sensor on bank 1 sensor 1.This is the front sensor on the left side on the exhaust system.Left side is bank 1 and right side is bank 2.Make sure the connections are good first.Usually it`s the internal heater in the o2 sensor.Hope this helps.Good luck.
Posted on Dec 12, 2009
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Posted on Jan 02, 2017
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