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Mercury BL8Z-9G444-A Lower Oxygen Sensor

2011 Mercury Mariner BL8Z9G444A

Customer Questions & Expert Answers (3)
BL8Z-9G444-A Ford Lower Oxygen Sensor Product Photo 1 of 1
BL8Z-9G444-A Ford Lower Oxygen Sensor Product Photo 1 of 1
BL8Z-9G444-A Ford Lower Oxygen Sensor Illustration 1 of 1
  • Part Description
    Sensor - Exhaust Gas - Oxygen
  • Base No.
    9G444
  • Manufacturer
    Ford
Make sure this part fits
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  • Specifications
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  • Q&A

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  • Product Specifications

    BrandGenuine Mercury
    Base No.9G444
    Manufacturer Part NumberBL8Z-9G444-A, BL8Z9G444A
    Part DescriptionLower Oxygen Sensor; Sensor - Exhaust Gas - Oxygen
    Item Dimensions8.6 x 7.8 x 7.9 inches
    Item Weight0.50 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerFord
    SKUBL8Z-9G444-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
    2011 Mercury Mariner4 Cyl 2.5L Duratec (110kW/150PS)4AT 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

  • Customer Questions & Expert Answers

    Q:
    Can you tell me if this part is correct for my car?
    A:
    You can Select Your Vehicle to check if BL8Z-9G444-A fits your vehicle.
    Posted and answered by Ford Parts Specialist Rick
    Q:
    How many Oxygen Sensor do the 2012 Ford Escape have? Posted by Malachi C.
    A:
    Four-cylinder vehicles have two heated Oxygen Sensor. One upstream (ahead of the catalytic converter) and one downstream (after the catalyst). You can Select Your Vehicle to see complete installation and repair tips.
    Answered by Ford Parts Specialist Sonny / Apr 26, 2025
    Q:
    What are the steps to replace the downstream Oxygen Sensor for the front cylinder bank in the 2011 Mercury Mariner? Posted by Yunus A.
    A:
    Disconnect the negative battery terminal. Disconnect the downstream oxygen sensor electrical connector. Raise the front of the vehicle and secure it on jackstands. Locate and unscrew the downstream oxygen sensor. Apply anti-seize compound if reinstalling the old sensor. Install the sensor and tighten it to the specified torque. Reconnect the battery and allow the PCM to relearn its idle and fuel trim strategy. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by Ford Parts Specialist Bastien / Dec 22, 2023

Genuine Ford Part BL8Z-9G444-A, the Right Choice

To ensure reliability, purchase part # BL8Z-9G444-A Lower Oxygen Sensor. It is also called Oxygen Sensor. 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 models.

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