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2001 BMW 330i Question: PO171 & PO174

 

Question

jhae, Mesa, AZ, March 10, 2010, 11:11
 Rookie

What causes those code to trigger? PO171 & PO174. Thanks all

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  • Medium-star Best Answer
    Honest1autocare (see my shops), March 10, 2010, 12:15
     Journeyman

    Crankcase Breather
    Leaking Exhaust System
    Dirty Fuel Injectors
    Restricted Fuel Injectors
    Insufficient Fuel Pressure
    Leaking Intake Manifold
    Defective Mass Air Flow (MAF) Sensor

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  • Answer #2

    Bret Bodas from RepairPal Test Shop, March 10, 2010, 12:20
     Master

    Hi, you can find out about the p0171 and p0174 dtc's here: http://repairpal.com/OBD-II-Code-P0171-and-P0174

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