Mechanics

CODE PO174 DIANOSIS

2002 Ford F-150 • 6 cylinder 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.
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Marydarline
November 13, 2010.




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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Wrenchtech
Nov 13, 2010.
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.

Tiny
Marydarline
Nov 13, 2010.

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