CODE PO174 DIANOSIS

  • Tiny
  • marydarline
  • 2002 Ford F-150
  • 6 CYL
  • 2WD
  • automatic

In a 2002 ford f150 4.2 6 cyl, we are getting a 174 code indicating bank 2 is running lean. Could this be cause by the O2 sensor, maf or pcv vale being clogged. Please help as we are getting too many answers as to why this code keeps coming up once we have cleared it.

Saturday, November 13th, 2010 AT 4:09 PM

2 Answers

  • Tiny
  • Wrenchtech
  • Expert
  • 19,589 posts

That's because there are dozens of causes for a lean code. The surprising thing is that you are not also getting a PO171 for the other bank. I have found that on Fords it's nearly always caused by a sever vacuum leak, usually from one of the main rubber vacuum lines

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Saturday, November 13th, 2010 AT 4:17 PM
  • Tiny
  • marydarline
  • Member

Originally(2 wks ago) we did get the PO171, but it has since cleared by disconnecting the neg term on the battery and not returned.

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Saturday, November 13th, 2010 AT 7:57 PM

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