What causes codes p-171 and p-174

Asked by Tstat Jan 31, 2015 at 12:53 PM about the 2006 Ford F-250 Super Duty Lariat SuperCab LB 4WD

Question type: Maintenance & Repair

I checked for vacuum leaks and replaced MAF sensor. Could it be O2 sensors?

1 Answer
4,695

Josh answered 9 years ago

P0171 Intake air leaks Faulty front heated oxygen sensor Ignition misfiring Faulty fuel injectors Exhaust gas leaks Incorrect fuel pressure Lack of fuel Faulty Mass Air Flow (MAF) sensor Incorrect Positive Crankcase Ventilation (PCV) hose connection P0174 Intake air leaks Faulty front heated oxygen sensor Ignition misfiring Faulty fuel injectors Exhaust gas leaks Incorrect fuel pressure Lack of fuel Faulty Mass Air Flow (MAF) sensor Incorrect Positive Crankcase Ventilation (PCV) hose connection I would do a Fuel pressure test first.

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