bears1950

[color=DarkRed]On a 1996 f-150 with the I-6 I am getting a P0174 code-bank 2 lean condition. Al o2 sensors have been replaced twice, as has the mass air sensor. The truck has 188,000 miles on it.

Any ideas as to what causes the Check Engine light condtion? Why does the computer say lean condition on bank 2 if the sensor has been replaced?

Help would be appreciated.

gdog1968

possibly catalytic converter

bears1950

Thanks for the reply. However, the Cat was replaced. Still the code appears.

Unregistered

Replace plenum gaskets,upper big gasket$15.00 and 6 gasket lower
$8.95 each.will work on 4.2 engine

miesk5

P0174
as unregestered advised...
look here for likely causes:
http://www.visi.com/~rhanson/obdII_codes-full-text.htm

they say to look @ PO171 causes...
test fuel pressure @ schrader valve.
Excessive fuel pressure
Leaking fuel injectors :
: : : leaking pressure regulator (a too common Ford problem!. :
: : : * Low fuel pressure :
: : : or running out of :
: : : fuel. :
: : : * Vapor recovery :
: : : system.
Induction system: :
: : : - Air leaks after :
: : : the MAF. :
: : : - Vacuum Leaks. :
: : : - PCV system. :
: : : - Improperly seated :
: : : engine oil :
: : : dipstick.
* EGR system: :
: : : - Leaking gasket. :
: : : - Stuck EGR valve. :
: : : - Leaking diaphragm :
: : : or EVR. :
: : : * Base Engine: :
: : : - Oil overfill. :
: : : - Cam timing. :
: : : - Cylinder :
: : : compression. :
: : : - Exhaust leaks :
: : : before or near :
: : : the HO2Ss.

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Unregistered

check vaccum leak possible pcv hose assembly