2003 Chevy Tahoe trouble code P0171This

Tiny
MO BASKIN
  • MEMBER
  • 2003 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
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?
Thursday, January 14th, 2010 AT 6:50 PM

1 Reply

Tiny
BLUELIGHTNIN6
  • 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.
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Thursday, January 14th, 2010 AT 6:58 PM

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