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Mercury 8S4Z-6A666-A PCV Valve

2009-2011 Mercury 8S4Z6A666A

Customer Questions & Expert Answers (2)
8S4Z-6A666-A Ford PCV Valve Product Photo 1 of 1
8S4Z-6A666-A Ford PCV Valve Product Photo 1 of 1
8S4Z-6A666-A Ford PCV Valve Illustration 1 of 1
  • Part Description
    Valve Assembly
  • Base No.
    6A666
  • Manufacturer
    Ford
Make sure this part fits
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  • Specifications
  • Fitment
  • Q&A

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  • Product Specifications

    BrandGenuine Mercury
    Base No.6A666
    Manufacturer Part Number8S4Z-6A666-A, 8S4Z6A666A
    Part DescriptionPCV Valve; Valve Assembly
    Item Dimensions6.4 x 4.2 x 4.2 inches
    Item Weight0.40 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerFord
    SKU8S4Z-6A666-A
    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
    2009-2011 Mercury Mariner4 Cyl 2.5L Duratec (110kW/150PS), 4 Cyl 2.5L PFI Gas/Electric4AT CD4E, 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), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
    2010-2011 Mercury Milan4 Cyl 2.5L Duratec HE PFI5-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

  • Customer Questions & Expert Answers

    Q:
    I am wondering if this is the exact part that fits in.
    A:
    You can Select Your Vehicle to check if 8S4Z-6A666-A fits your vehicle.
    Posted and answered by Ford Parts Specialist Tim
    Q:
    How to remove and replace the PCV Valve in Ford Fusion? Posted by Sylvie D.
    A:
    For 1.5L, 1.6L, and 2.0L models, remove the intake manifold and starter before detaching the oil vent separator, clean the engine block, and install a new gasket. For 2.3L and 2.5L models, the PCV valve is under the intake manifold. Remove the manifold and disconnect the PCV hose.
    You can Select Your Vehicle to see complete installation and repair tips.
    Answered by Ford Parts Specialist Clayton / Oct 19, 2025

Genuine Ford Part 8S4Z-6A666-A, the Right Choice

To ensure reliability, purchase part # 8S4Z-6A666-A PCV Valve. 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 Mercury Mariner, Milan models.

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