Question about 2001 GMC Sierra 2500HD
You can't adjust them. The only way for you to fix this problem is to replaced the oxygen sensors. The sensors are what determine if it is running lean or not and just have to be replaced as they eventually go bad. You actually have 4 oxygen sensors. They are located on the exhaust pipes leaving your engine. You will have one right and left just after the manifold and one right and left just after the catalytic convertors. You will may need a special oxygen sensor wrench that you can actually borrow from Auto Zone or Advance Auto Parts that will make changing these out much easier for you. Let me know if you have any further questions about this. Thanks for using FixYa!
Posted on Jul 30, 2009
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Posted on Jan 02, 2017
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