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Mercury 3L3Z-12B579-BA Mass Air Flow Sensor

2004-2011 Mercury 3L3Z12B579BA

Customer Questions & Expert Answers (2)
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  • Part Description
    Sensor Assembly
  • Base No.
    12B579
  • Manufacturer
    Ford
Make sure this part fits
$140.30 MSRP: $227.27
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  • Specifications
  • Fitment
  • Q&A

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  • Product Specifications

    BrandGenuine Mercury
    Base No.12B579
    Manufacturer Part Number3L3Z-12B579-BA, 3L3Z12B579BA
    Part DescriptionMass Air Flow Sensor; Sensor Assembly
    Manufacturer Note4.6L, Police
    Item Dimensions6.4 x 2.4 x 2.5 inches
    Item Weight1.30 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerFord
    SKU3L3Z-12B579-BA
    WarrantyThis genuine Ford part is guaranteed by Ford's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65

  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    2005-2011 Mercury Grand Marquis8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI4AT 4R70W, 4-Speed Automatic Transmission 4R75E Livonia, Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
    2005-2011 Mercury Mariner4 Cyl 2.3L, 4 Cyl 2.3L Hybrid Gas/Electric DOHC, 4 Cyl 2.5L Duratec (110kW/150PS), 4 Cyl 2.5L PFI Gas/Electric, 6 Cyl 3.0L DOHC EFI Modular, 6 Cyl 3.0L OHC Duratec4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
    2006-2011 Mercury Milan4 Cyl 2.3L, 4 Cyl 2.5L Duratec HE PFI, 4 Cyl 2.5L PFI Gas/Electric, 6 Cyl 3.0L DOHC EFI, 6 Cyl 3.0L OHC Duratec, 6 Cyl 3.5L DOHC VCT SMPI5-Speed Automatic Transmission Mazda FNR5, 5-Speed Manual Transmission (G5M), 6-Speed Automatic Transaxle - AWF21, 6-Speed Automatic Transmission 6F Mid-Range, 6-Speed Manual Transmission Mazda G6M, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
    2005-2007 Mercury Montego6 Cyl 3.0L DOHC EFI Modular6-Speed Automatic Transaxle - AWF21, CVT Select Shift Transmission, Four-Wheel Drive (Part Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
    2004-2010 Mercury Mountaineer6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
    2008-2009 Mercury Sable6 Cyl 3.5L DOHC VCT SMPI6-Speed Automatic Transaxle - AWF21, 6-Speed Automatic Transmission 6F50, CVT Select Shift Transmission, Four-Wheel Drive (Part Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive

  • Customer Questions & Expert Answers

    Q:
    I would like to know is this part gonna fit with my car.
    A:
    You can Select Your Vehicle to check if 3L3Z-12B579-BA fits your vehicle.
    Posted and answered by Ford Parts Specialist George
    Q:
    How to remove and install the Intake Air Temperature Sensor and Mass Air Flow Sensor on the air intake duct of a Ford Fusion? Posted by Bruwil T.
    A:
    To remove the Mass Air Flow (MAF)/Intake Manifold Temperature (IMT) start by removing the air intake duct and disconnecting the electrical connector from the MAF/IMT sensor. Remove the MAF/IMT sensor mounting fasteners and remove the sensor from the air filter housing. Installation is the reverse of removal.
    You can Select Your Vehicle to see complete installation and repair tips.
    Answered by Ford Parts Specialist Clayton / Nov 05, 2025

Genuine Ford Part 3L3Z-12B579-BA, the Right Choice

To ensure reliability, purchase part # 3L3Z-12B579-BA Mass Air Flow Sensor. It is also called Mass Air Flow Sensor, Temperature Sending Unit. OEM parts are of high quality and known for their longevity. This is because they are built to the Ford standards which are relatively high and undergo rigorous quality control testing. This part fits specific Mercury Mariner, Montego, Mountaineer models.

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