1996 F-150 4.9l Dtc P0171 And P0174 - Ford Truck Enthusiasts Forums

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1996 F-150 4.9l Dtc P0171 And P0174

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Old 09-10-2007, 08:14 AM
joe.mcfadden joe.mcfadden is offline
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1996 F-150 4.9l Dtc P0171 And P0174

Hello all

I just replaced my EGR valve position sensor, both up stream oxygen sensors. And battery. I cleared all the DTC’s, then drove 10 miles. The dreaded DTC P0171 and P0174: system too lean came up again. I am thinking fuel pressure next to look at. Any suggestion out there? Thanks.
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Old 09-10-2007, 06:55 PM
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kcb37 kcb37 is offline
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How long has it been since you changed you fuel filter? I have had a few friends with 2 98's and 1 2000 that did that around 80, or 90,000 on the factory filter.
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Old 05-09-2010, 06:33 PM
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I see its been awhile since u posted. Did u ever get the truck fixed? what was the problem?
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171, 1996, 450, 49, 49l, 96, 98, code, dtc, f150, ford, oxygen, p0171, po, po171, po174, sensors, trouble

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