2003 Chevy Tahoe trouble code P0171This

2003 CHEVROLET TAHOE
140,000 MILES • V8 • 4WD • AUTOMATIC
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MO BASKIN
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  • 1 POST
This trouble code Running lean(bank 2)
what should I be checking ? I understand running to lean means not enough air, 02 sensor or what?
Jan 14, 2010 at 10:50 AM
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BLUELIGHTNIN6
  • ✓Experienced Mechanic
  • 16,542 POSTS
Hello and thanks for the donation!

This is most commonly caused by a faulty oxygen sensor or clogged catalytic converter. You can test the oxygen sensors and see if they are working properly. Also check for carbon build up at the EGR valve passage, this can cause the oxygen sensors to fail.
Jan 14, 2010 at 10:58 AM
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