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Ford 4L5Z-6A666-AA Valve Assembly

2004-2019 Ford 4L5Z6A666AA

Customer Questions & Expert Answers (3)
4L5Z-6A666-AA Ford Valve Assembly Product Photo 1 of 2
4L5Z-6A666-AA Ford Valve Assembly Product Photo 1 of 2
4L5Z-6A666-AA Ford Valve Assembly Product Photo 2 of 2
4L5Z-6A666-AA Ford Valve Assembly Illustration 1 of 1
  • Base No.
    6A666
  • Replaced By
    KR3Z-6A666-B
  • Manufacturer
    Ford
Make sure this part fits
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  • Specifications
  • Fitment
  • Q&A

  • Related Parts

    Shop for related parts for your vehicle

  • Product Specifications

    BrandGenuine Ford
    Base No.6A666
    Manufacturer Part Number4L5Z-6A666-AA, 4L5Z6A666AA
    Part DescriptionValve Assembly
    Item Dimensions6.2 x 4.2 x 4.2 inches
    Item Weight0.50 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerFord
    SKU4L5Z-6A666-AA
    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
    2005-2008 Ford Escape6 Cyl 3.0L DOHC EFI Modular4AT 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)
    2015-2019 Ford F-1506 Cyl 3.3L Duratec, 6 Cyl 3.5L Cyclone Petrol TIVCT10-Speed Automatic Transmission (10R80), 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
    2005-2007 Ford Five Hundred6 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
    2005-2007 Ford Freestyle6 Cyl 3.0L DOHC EFI ModularCVT Select Shift Transmission, Four-Wheel Drive (Part Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
    2011 Ford Mustang6 Cyl 3.7L PFI NA6-Speed Automatic Transmission (6R80), 6-Speed Manual Transmission (T56), 6-Speed Manual Transmission-MT82, Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
    2004-2008 Ford Ranger6 Cyl 3.0L OHV EFI5-Speed Automatic Transmission - 5R44E/5R55E, 5-Speed Manual Transmission - R1HD, 5-Speed Manual Transmission M5R1, Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
    2004 Ford Taurus6 Cyl 3.0L4AT 4F50N
    2005-2008 Mercury Mariner6 Cyl 3.0L DOHC EFI Modular4AT 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)
    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 Mercury Sable6 Cyl 3.0L4AT 4F50N

  • Customer Questions & Expert Answers

    Q:
    Is this the correct part for the attached VIN?
    A:
    You can Select Your Vehicle to check if 4L5Z-6A666-AA fits your vehicle.
    Posted and answered by Ford Parts Specialist Matthew
    Q:
    How does the PCV Valve system work for the 2004 Ford Ranger? Posted by Cezar N.
    A:
    The PCV system works by circulating fresh air from the air cleaner through the crankcase, where it mixes with blow-by gases. It then reroutes this mixture through a PCV valve to the intake manifold. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by Ford Parts Specialist Clayton / Mar 10, 2025
    Q:
    What is the installation process for the crankcase vent oil separator and PCV Valve on the 2006 Mercury Mariner? Posted by Jonny D.
    A:
    Installation is the reverse of removal, ensuring to use a new gasket and tighten the bolts to the specified torque. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by Ford Parts Specialist Sonny / Jan 11, 2026

Genuine Ford Part 4L5Z-6A666-AA, the Right Choice

To ensure reliability, purchase part # 4L5Z-6A666-AA Valve Assembly. It is also called PCV Valve. 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 Ford F-150, Mustang, Ranger models. It fits Mercury Mariner, Montego, Sable.

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