CODE PO174 DIANOSIS

2002 Ford F-150

Tiny

marydarline

November, 13, 2010 AT 4:09 PM

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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2 Answers

Tiny

Wrenchtech

November, 13, 2010 AT 4:17 PM

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

Tiny

marydarline

November, 13, 2010 AT 7:57 PM

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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